# Presort: bundles, trays, pallets and labeling lists To earn presort prices, a mailer sorts a bulk mailing by ZIP Code into bundles, trays, sacks and pallets, finest level first.[^1][^2] In general, the finer the sort, the lower the price.[^3] USPS [labeling lists](https://postalref.com/products/labeling-lists.md) give the destination each container is labeled to.[^4] Updated November 5, 2026. 57 sources. ## Questions ### What is considered bulk mail at the post office? Bulk mail is a quantity of mail prepared for reduced postage prices, such as a presorted mailing of catalogs that USPS verifies.[^5] Business mail discounts need at least 500 pieces of First-Class Mail, or 200 pieces or 50 pounds of [USPS Marketing Mail](https://postalref.com/guides/mail-classes.md), per mailing.[^6] ### What does presorted First-Class Mail mean? Presorted First-Class Mail is a price category for a First-Class Mail mailing of at least 500 addressed pieces, sorted and prepared to mailing standards.[^3] As First-Class Mail, it carries bills, statements of account and other matter that must generally be mailed First-Class.[^7][^8] Its pieces need not bear a barcode, though presorted, barcoded pieces can get [automation prices](https://postalref.com/guides/mail-classes.md), which are generally lower.[^3][^9] ### How do I get presorted First-Class Mail prices? A mailer pays the annual First-Class Mail mailing fee, then brings mailings of at least 500 pieces to a Business Mail Entry Unit, where a postal facility accepts bulk mail.[^6][^10] As of October 4, 2026, the fee is $390 at each office of mailing, and it allows every [First-Class Mail price](#levels).[^11][^8] Each mailing needs a postage statement, and the mailer needs a mailing permit for the way it pays postage, as [paying for postage](https://postalref.com/guides/paying-postage.md) explains.[^6] ### How does USPS bulk mail work? The mailer groups the pieces by ZIP Code, carrier route or walk sequence, so the mail bypasses some USPS sorting operations.[^3] In general, the finer the sort, the lower the price.[^3] A presorted mailing generally carries [documentation](https://postalref.com/guides/edoc.md) of its presort, which USPS compares with the mail to verify the postage claimed.[^12] ### What do I need to do to secure bundles (strapping)? Bundles of flats need two or more cross-strapped bands, or shrinkwrap with one or more cross-strapped bands, around the bundle's length and girth.[^12] Twine, string, rubber bands, wire and metal banding are not allowed, and bands must be tight enough to depress the bundle's edges.[^12] Letter bundles up to 1 inch thick need one band around the girth, and thicker ones need at least two.[^12] ### What are the size and weight limits for a pallet of mail? A mail pallet measures 48 by 40 inches, and a loaded pallet weighs at most 2,200 pounds and stands at most 77 inches high.[^13] Stacked pallets, two to six tiers high, may weigh no more than 2,200 pounds together and stand no more than 84 inches.[^13] ### Do I need certified presort software for a bulk mailing? Presort documentation must come from software certified under PAVE or MAC, USPS's software certification programs, or be prepared as standardized documentation.[^12][^14][^15] Bundle reallocation, an optional way to build pallets, requires PAVE-certified presort software.[^13] ### What is the difference between copalletizing and commingling mail? Copalletizing puts mail from two or more separately produced mailings together on pallets, while commingling merges dissimilar mail into one mailing.[^16][^17] Unlike a combined mailing, a commingled mailing needs 150 pieces per ZIP Code to get 5-digit prices.[^18] ## How it fits together A presort sorts a mailing by presort level, the degree to which its pieces share a ZIP Code, carrier route or processing facility.[^3] The principal levels run from firm and [carrier route](https://postalref.com/guides/saturation-mail.md), the finest, through 5-digit, 3-digit and sectional center facility, or SCF, to mixed.[^3] Mailers generally sort to the finest level first and finish each level before the next.[^1] Pieces for one presort destination travel in a handling unit: a bundle, sack, tray or tub.[^19] Handling units ride in containers such as pallets, gaylords and all-purpose containers.[^20] Each container carries a label that names its destination, its contents and its origin.[^21] [Full-Service](https://postalref.com/guides/full-service.md) is the automation option that pairs a unique barcode on every piece, tray and container with electronic documentation.[^22] Its mailings must use [Intelligent Mail tray labels](https://postalref.com/guides/intelligent-mail.md) on all trays and sacks.[^12] [Labeling Lists](https://postalref.com/products/labeling-lists.md) are USPS's lists of 3- and 5-digit ZIP Codes and the destinations their containers are labeled to.[^4] The mailer combines pieces whose ZIP Codes share a destination in a list and labels their container to it.[^23] The lists change often, and USPS publishes each change in the Postal Bulletin.[^4] Certified presort software sorts the addresses and produces the documentation that supports the postage statement.[^14][^12] Mailers and consolidators also combine or copalletize mailings, so mail that misses the pallet minimums alone may meet them together.[^24][^13] A mailer may carry the containers privately to a postal facility nearer their destination, a [drop shipment](https://postalref.com/guides/mail-entry.md) that often earns a lower price.[^25] ## Presort levels A presort level says how much of their address the pieces in a bundle or container share.[^3] The levels for USPS Marketing Mail letters are these: - Carrier route: all pieces go to the same city route, rural route, highway contract route, Post Office box section or general delivery unit.[^1] - 5-digit: all pieces share one 5-digit ZIP Code.[^1] - 3-digit: all pieces have ZIP Codes that begin with the same three digits.[^1] - SCF: pieces for two or more 3-digit areas served by the same sectional center facility or local processing center.[^1] - Mixed: pieces for the service areas of more than one SCF or local processing center.[^1] First-Class Mail letters and cards have no carrier route level: their levels run from 5-digit to mixed.[^26] In general, the finer the level, the lower the price.[^3] From July 12, 2026, a presorted First-Class Mail automation letter up to 3.5 ounces costs $0.621 at 5-digit, $0.672 at 3-digit and $0.707 at mixed.[^27][^8] A nonautomation machinable letter costs $0.674 at 3-digit and $0.721 at mixed.[^8] An automation postcard costs $0.453 at 5-digit, $0.478 at 3-digit and $0.495 at mixed.[^8] A scheme lets a mailer put pieces for two or more 5-digit or 3-digit areas in one bundle or container.[^28] Labeling lists name the schemes, such as `L012`, which groups 5-digit ZIP Codes so their letters can share a tray at 5-digit automation prices.[^29][^30] Until July 12, 2026, First-Class Mail, USPS Marketing Mail and Periodicals had prices for pieces sorted to an area distribution center, or ADC.[^27][^23] On that date USPS replaced them with 3-digit prices and renamed mixed ADC, pieces for more than one ADC, to Mixed.[^27][^31] USPS still publishes `L004`, the labeling list that groups 3-digit ZIP Code prefixes by ADC, with no changes for November 1, 2026.[^32][^33] A level needs the volume its standard sets, such as 150 pieces for a 5-digit tray of USPS Marketing Mail automation letters.[^1] The mixed tray takes the rest, with no minimum.[^1] Pieces without the volume for any destination are residual mail, which usually does not qualify for a presort price.[^1] ## Bundles, trays and sacks A handling unit is the bundle, sack, tray or tub that carries pieces sorted to one price level and ZIP Code destination.[^19] A bundle is a group of addressed pieces secured together as a unit.[^12] Its pieces face the same way, with an address visible on the top piece.[^12] Letters go in letter trays with sleeves.[^12] Flats go in flat trays under lids, green side up for First-Class Mail and white side up for Periodicals and USPS Marketing Mail.[^12] Sacks carry flats, parcels and loose mail.[^34] A tray or a sack and its contents may weigh no more than 70 pounds.[^12] Unless excepted, a bundle that is not a carrier route bundle shows its presort level by an optional endorsement line or a barcoded label.[^13] An optional endorsement line is a set of printed characters on the top line of the address block that names the bundle's sortation level.[^35] Each level's bundle label has its own color and characters.[^12] | Presort level | Bundle label | | --- | --- | | Firm, Periodicals only | blue `F`[^12] | | 5-digit scheme | red `5 SCH`[^12] | | 5-digit | red `5`[^12] | | 3-digit scheme | green `3 SCH`[^12] | | 3-digit | green `3`[^12] | | SCF | pink `A`[^12] | | Mixed | tan `X`[^12] | - **Handling Unit**, also called HU: “the equipment (bundles, sacks, trays, and tubs) used to carry mailpieces that have been sorted to a price level for a ZIP Code destination”[^19] - **bundle**: “A bundle is a group of addressed pieces secured together as a unit.”[^12] - **letter tray**, also called envelope tray: “A flat cardboard or plastic container for sorted letter-size mail that can hold several hundred letters. Various kinds and sizes of trays are used in place of sacks or pouches for transporting mail within and between major postal facilities. Certain price categories, especially automation prices, require the use of trays.”[^36] - **flats tray**, also called tub, flats tub, flat tray: “A four-sided tray used in both mechanized and nonmechanized facilities for flat-size mail that may be secured on top with a separate lid and strapping. It is much taller and shorter than a letter tray.”[^37] - **sack**, also called mail sack: “(1) A container generally used to transport flat-size mail, parcels, and loose pack mail. It is made of sewn fabric (usually nylon, polyester, canvas, or plastic with an opening at one end) and is closed with a draw cord and fastener. (2) In mail processing or dispatch functions, to place mail in a sack.”[^34] ## Pallets and other containers A container carries a set of handling units: a pallet, a gaylord or an all-purpose container.[^20] A pallet measures 48 by 40 inches, holds 2,200 pounds and takes a forklift from all four sides.[^13] Each loaded pallet is held with two or more straps or bands, stretch or shrink plastic, or both.[^13] A pallet of trays needs the plastic, since straps alone are not permitted.[^13] For Periodicals, USPS Marketing Mail, Parcel Select and Package Services, a destination with enough mail must get a pallet.[^13] The threshold is 500 pounds of bundles, sacks, flat trays or parcels, or 72 linear feet or six layers of letter trays.[^13] A pallet in one mailing holds at least 250 pounds of bundles, parcels or sacks, with exceptions.[^13] Pallets for a destination delivery unit's own service area have no minimum.[^13] Palletizing First-Class Mail is optional, under the standards or a local customer/supplier agreement.[^13] A customer/supplier agreement is a joint agreement with one mailer at one location that sets palletization rules and entry points for its First-Class Mail.[^38] With the origin plant manager's approval, the mailer may use all-purpose containers or other USPS-approved containers.[^13] A logical pallet is the mail for one destination and presort level, however many physical pallets hold it.[^39][^1] For example, 2,800 pounds for one SCF form one logical SCF pallet, placed on two physical pallets of 1,400 pounds each.[^1] Full-Service electronic documentation, or [eDoc](https://postalref.com/guides/edoc.md), identifies both physical and logical containers.[^20] > Pallet sortation is sequential from the lowest (finest) level to the highest and must be completed at each required level before the next optional or required level is prepared.[^13] **Must.** Pallets are built from the finest level up, and each required level must be finished before the next level begins. - **Container**, also called mail container: “the term used to describe the mail containers (pallet, Gaylord, all-purpose container, etc.) used to carry an aggregate of handling units”[^40] - **general purpose mail container**, also called GPMC, GPC, APC, general purpose container, all-purpose container: “A wheeled multipurpose container constructed of square steel tubing and sheet steel material that is nestable (i.e., it can be stored in an L-shaped configuration) and is used to transport, stage, and distribute sacks, trays, and bundles. More than 5 feet tall, with a maximum cargo load of 1,200 pounds, the container can be pushed by hand or pulled by tractor. Two fold-back shelves are provided (one on the bottom and one halfway up) to separate the load in the container if required. The GPMC has retractable doors that, when closed, make the container a full container, protecting the mail and preventing mail from falling from the GPMC in transit.”[^41] - **pallet**, also called skid: “A reusable platform or skid on which mail is stacked to be moved as a single unit. Pallets are made of rigid material such as wood or plastic designed for four-way forklift entry and capable of handling loads of up to 65 cubic feet and 2,200 pounds. A USPS pallet measures 48 by 40 inches.”[^42] - **gaylord**: “A pallet-size box used for shipping mail in bulk quantities. It is usually constructed of triple wall corrugated fiberboard that fits on standard pallets. The first triple-wall corrugated pallet boxes were manufactured by the Gaylord Container Corporation.”[^43] - **Customer Supplier Agreement**, also called CSA, Customer Service Agreement: “The CSA is a joint agreement created with a specific mailer at a specific location that defines palletization rules and entry locations for that mailer’s First-Class volume.”[^38] ## Labeling lists and container labels A tray or sack label has three lines: a destination line, a content line and an origin line.[^21] Line 1 holds only what the standard specifies, including a facility prefix such as `SCF`.[^12] Line 2 shows the class and processing category of the mail.[^12] Line 3 shows the entry Post Office's city and state, or the mailer's name and location.[^12] Line 1 of a scheme or facility container comes from a [labeling list](https://postalref.com/products/labeling-lists.md).[^23] The mailer finds the pieces' ZIP Codes in Column A and labels the container to the destination in Column B.[^23] For example, `L005` gives the SCF destinations for letters.[^44] Mailers are expected to label by the lists in effect when the mail is inducted.[^33] A mixed tray of USPS Marketing Mail automation letters shows `MXD WKG` on Line 1 in place of a list destination.[^1] Each pallet carries two labels, one on each of two adjacent sides.[^13] Pallet labels are pink for Periodicals and white for the other classes.[^13] A label bearing an [Intelligent Mail container barcode](https://postalref.com/guides/intelligent-mail.md) goes on the outside of the shrinkwrap or plastic.[^13] - **tray label**: “A strip of paper or cardstock (machine-printed singly or in multiples) used to identify mail in containers by showing destination line (office of distribution and ZIP Code), content line (mail class or product, mail processing category, sortation level, and barcoding), and origin line (city and state entry Post Office or mailer’s name and city and state of mailer). The label is placed in label holders on pouches, sacks, trays, and on pallets and other types of mail transport equipment.”[^21] - **Optional Endorsement Line**, also called OEL: “A series of specific printed characters on the top line of the address block that identifies the sortation level of a bundle and may contain an ACS participant code.”[^35] - **MXD**: “An abbreviation used on mail container labels that identifies the contents as mixed mail for different destinations processed at a single facility (such as for multiple ADCs). Mail in such containers is generally residual mail that USPS combines with other residual mail to achieve sufficient volumes for processing and dispatch.”[^45] - **WKG**: “An abbreviation used on mail container labels that identifies the contents as mail requiring sorting and distribution (“working”) by USPS.”[^46] ## Presort software and machines Presort Accuracy Validation and Evaluation, or PAVE, is a voluntary USPS program that tests vendors' presort software for accurate sorting and documentation.[^14] Documentation from PAVE-certified software counts as standardized documentation, the report that supports the postage statement.[^12][^47] Manifest Analysis Certification, or MAC, is the same kind of program for manifest software, testing how accurately it calculates postage and fees.[^15] A multi-line optical character reader, or MLOCR, is equipment a mail service provider uses to apply barcodes and presort mail.[^35] Mail sorted on an MLOCR or barcode sorter, with standardized documentation, need not be grouped by 3-digit prefix in SCF trays.[^12] MLOCR mailings often fill several trays for one destination, and the mailer cannot tell which tray holds a given piece.[^19] The mailer's eDoc then groups those trays as one logical handling unit.[^19] > Mailers must use PAVE-certified presort software to prepare mailings using bundle reallocation.[^13] **Must.** A mailer who reallocates bundles on pallets must sort the mailing with PAVE-certified presort software. - **Presort Accuracy Validation and Evaluation**, also called PAVE: “A voluntary certification program in which USPS tests vendors’ presort software to determine its accuracy in sorting address information according to postal requirements and in producing standardized documentation.”[^14] - **Manifest Analysis Certification**, also called MAC: “A voluntary certification program in which USPS tests vendors’ manifest software to determine its accuracy in calculating postage and fees and producing listings of mailpieces, facsimile postage statements, and other documentation meeting applicable standard.”[^15] - **standardized documentation**: “A report that shows a complete breakdown of a mailing, including piece counts by price, that supports the claims on the postage statements accompanying the mailing. The report contains specific data presented in a uniform format.”[^47] - **Multi-Line Optical Character Reader**, also called MLOCR: “Equipment used by mail service providers that applies a barcode and presorts mail, enabling the mail owner to take advantage of automation discounts.”[^35] ## Combining mailings A mailer who combines Periodicals publications, or copalletizes Periodicals or USPS Marketing Mail flats, must reach the finest presort level for the whole mailing.[^13] With bundle reallocation, some bundles may not reach the finest pallet level possible.[^13] A mailer who cannot meet the pallet minimums alone may still qualify if the copalletized, combined or commingled mailing meets them.[^13] A combined mailing merges and sorts together pieces of the same class, usually paid by two or more postage payment methods.[^48] Copalletizing keeps each mailing's independently sorted bundles and consolidates them on shared pallets.[^16][^13] Commingling merges dissimilar mail into one mailing, and needs 150 pieces per ZIP Code for 5-digit prices.[^17][^18] A consolidator is a mailing agent who aggregates mailings prepared by individual mailers and carries them to a destination facility.[^24] In third-party copalletization, mail moves from each origin mailer's plant to the consolidator's plant.[^49] The consolidator's eDoc must show which bundle or tray is on which pallet.[^49] Postage for copalletized flat-size Periodicals is paid at the consolidator's site.[^13] Authorized mailers may combine USPS Marketing Mail, Bound Printed Matter and Periodicals flats in one mailing, bundled on pallets.[^13] USPS processes these combined mailings to USPS Marketing Mail service standards.[^13] In Mail.dat, an industry-defined database of linked files, such a mailing is a co-mailing.[^50][^51] Copalletized and combined mailings need specific authorization from Business Acceptance Solutions when the standards require it.[^13] The written request must arrive at least 30 days before the first mailing.[^13] ## What goes wrong A virtual sack is a group of bundles sorted to the sack level in the eDoc and sent to a consolidator to be copalletized.[^52][^53] A tray or virtual sack marked for copalletization that no consolidator eDoc places on a pallet is an Unlinked Copal error.[^54] The consolidator must link those trays or sacks to their containers within 14 days of the original eDoc's mailing date.[^55] Above the error threshold, USPS removes the [Full-Service](https://postalref.com/guides/full-service.md) discount from the pieces in those handling units.[^56] A mailer whose pallets keep failing load-integrity standards after notice is suspended from the pallet program.[^13] If the [documentation](https://postalref.com/guides/edoc.md) does not let USPS verify a mailing, the postmaster may require more information.[^12] Failing to provide it is reason for USPS to refuse the mailing.[^12] Illegible tray and sack labels are not acceptable.[^12] In Mail.dat, a container record without a valid labeling list effective date fails with a Date Data Type Error, as [Labeling Lists](https://postalref.com/products/labeling-lists.md) explains.[^57] ## Index: 12 entries ### Service (1) - [Labeling Lists](https://postalref.com/products/labeling-lists.md) ### Program (1) - [Customer Supplier Agreement](https://postalref.com/guides/presort.md#containers) ### System (1) - [Multi-Line Optical Character Reader](https://postalref.com/guides/presort.md#software) ### Containers (3) - [Container](https://postalref.com/guides/presort.md#containers) - [general purpose mail container](https://postalref.com/guides/presort.md#containers) - [Handling Unit](https://postalref.com/guides/presort.md#handling-units) ### Role (1) - [Consolidator](https://postalref.com/?q=Consolidator) ### Terms (5) - [five-digit scheme](https://postalref.com/products/labeling-lists.md#terms) - [Mixed Area Distribution Center](https://postalref.com/products/labeling-lists.md#terms) - [OMX](https://postalref.com/products/labeling-lists.md#terms) - [Optional Endorsement Line](https://postalref.com/guides/presort.md#labels) - [three-digit scheme](https://postalref.com/products/labeling-lists.md#terms) ## Sources [^1]: [DMM 245: USPS Marketing Mail, Mail Preparation (July 2026)](https://pe.usps.com/text/dmm300/245.htm): “Presort is the process by which a mailer prepares mail so that it is sorted to at least the finest extent required by the standards for the price claimed. … Generally, presort is performed sequentially, from the lowest (finest) level to the highest level, to those destinations specified by standard and is completed at each level before the next level is prepared. … all pieces for delivery to the same city route, rural route, highway contract route, Post Office box section, or general delivery unit. … the delivery address on all pieces includes the same 5-digit ZIP Code. … the ZIP Code in the delivery address on all pieces begins with the same three digits … the separation includes pieces for two or more 3-digit areas served by the same sectional center facility (SCF)/local processing center (LPC) … the pieces are for delivery in the service area of more than one SCF/LPC. … 5-digit/scheme: optional, but required for 5-digit price (150-piece minimum); overflow allowed. … Mixed: required (no minimum); group pieces by SCF when overflow pieces from SCF trays are placed in mixed rays. For Line 1 labeling: use “MXD WKG.” … Residual mail lacks the volume set by standard to require or allow preparation to a particular destination, and usually does not qualify for a presort price. … For pallets, 2,800 pounds of mail may be destined to an SCF/LPC (letters and flats) or SCF/RPDC (parcels) destination, and these would form the “logical” SCF pallet, but the mail is placed on two SCF pallets, each weighing 1,400 pounds because of the 2,200-pound-maximum pallet-weight requirement.” [^2]: [Publication 32: Glossary of Postal Terms](https://postalpro.usps.com/mnt/glusterfs/2016-04/pub32_glossary.pdf#page=33), page 29: “Bundles are placed into mail processing containers like trays or sacks or onto pallets.” [^3]: [Publication 32: Glossary of Postal Terms](https://postalpro.usps.com/mnt/glusterfs/2016-04/pub32_glossary.pdf#page=182), PDF page 182: “In general, the finer the sortation, the lower the price (e.g., Standard Mail pieces sorted by the same 5-digit ZIP Code such as 20008 are considered more finely sorted than pieces for the same 3-digiti ZIP Code prefix such as 200 and thus receive a lower price). … A nonautomation price category for a First-Class Mail mailing that consists of at least 500 addressed mailpieces and is sorted and prepared according to mailing standards. … This mail is not required to bear a barcode. … A form of mail preparation, required to bypass certain postal operations, in which the mailer groups pieces in a mailing by ZIP Code or by carrier route or carrier walk sequence (or other recommended separation). … The degree to which mail is sorted by ZIP Code or ZIP Code ranges or carrier routes to the mail processing facility or delivery unit that serves the delivery address of the mail. … The principal presort levels, starting with the finest level, include: (a) firm, (b) carrier route, (c) 5-digit, (d) 5-digit scheme, (e) merged 5-digit, (f) merged 5-digit scheme, (g) 3-digit, (h) unique 3-digit, (i) 3-digit scheme, (j) origin/optional 3-digit(s), (k) SCF, (l) origin/optional SCF, (m) ADC/AADC, (n) ASF/NDC, (o) DNDC, (p) DSCF, (q) NDC presort, (r) ONDC presort, (s) mixed (NDC, ADC, AADC, etc.), and (t) residual (pieces, bundles, sacks).” [^4]: [PostalPro: Labeling Lists](https://postalpro.usps.com/operations/labeling-lists): “The Labeling Lists Data Product assists mailers with presorting mail by providing active, originating 3- and 5-digit ZIP Code™ data, along with their destination locations, for labeling purposes. … Labeling lists change frequently. … Updates to the Labeling Lists are also published in the Postal Bulletin.” [^5]: [Publication 32: Glossary of Postal Terms](https://postalpro.usps.com/mnt/glusterfs/2016-04/pub32_glossary.pdf#page=32), PDF page 32: “Broadly, the term can designate quantities of mail prepared for mailing at reduced postage prices such as a presorted mailing of catalogs that requires verification.” [^6]: [Election Mail Permit Based Solutions](https://postalpro.usps.com/mnt/glusterfs/2022-07/2022.07.22_Election%20Mail%20Permit%20Based%20Solutions_v1.pdf#page=1), PDF page 1: “To qualify for business mail postage discounts, a minimum number of pieces is required per mailing: … 500 pieces for First-Class Mail … 200 pieces (or 50 pounds of mail) for USPS Marketing Mail … Annual Mailing Fee - Regardless of the postage payment method, both First-Class Mail and USPS Marketing Mail mailing permits require an annual mailing fee to be paid. … All business mail must be brought to a Business Mail Entry Unit (BMEU). … Postage statements must be submitted for all business mailings as specified by the standards for the class of mail and the prices claimed. … A mailing permit grants permission to use a certain postage payment method for commercial (business) mailings.” [^7]: [USPS Report on Form 10-K, fiscal year 2025](https://about.usps.com/what/financials/10k-reports/fy2025.pdf#page=7), PDF page 7: “First-Class Mail includes: letters, postcards, bills or statements of account, and payments.” [^8]: [PRC: Mail Classification Schedule through July 12, 2026 (docx, converted to HTML with mammoth)](https://www.prc.gov/sites/default/files/mcs/MCS%20Through%2007122026.docx): “Matter containing personal information, partially or wholly handwritten or typewritten matter, or bills or statements of account must be mailed by First-Class Mail service, unless: (1) it is mailed by Priority Mail Express service or Priority Mail service, (2) it meets the USPS Marketing Mail or Periodicals mail preparation requirements for incidental First-Class Mail attachments or enclosures, or (3) it is otherwise exempt under title 39, United States Code. … An annual mailing fee is required to be paid at each office of mailing by any person who mails at presorted or automation prices (1505.2). Payment of the fee allows the mailer to mail at any First-Class Mail price. … | **Maximum Weight (ounces)** | **5-Digit ($)** | **3-Digit ($)** | **Mixed ($)** | … | 3.5 | 0.621 | 0.672 | 0.707 | … | 3.5 | 0.674 | 0.721 | … | not applicable | 0.453 | 0.478 | 0.495 |” [^9]: [Publication 32: Glossary of Postal Terms](https://postalpro.usps.com/mnt/glusterfs/2016-04/pub32_glossary.pdf#page=26), PDF page 26: “A price category for mail that is presorted and prebarcoded and that meets addressing, readability, and other requirements for mail that can be processed on automated equipment. … Automation prices are generally lower than prices for single-piece mail or nonautomation presorted mail.” [^10]: [Publication 32: Glossary of Postal Terms](https://postalpro.usps.com/mnt/glusterfs/2016-04/pub32_glossary.pdf#page=34), PDF page 34: “The area of a postal facility where mailers present bulk, presorted, and permit mail for acceptance.” [^11]: [Notice 123: Price List (effective October 4, 2026)](https://pe.usps.com/text/dmm300/Notice123.htm): “Notice 123 • Effective October 04, 2026 … | First-Class Mail Presort, per office of mailing | $390.00 |” [^12]: [DMM 203: Basic Postage Statement, Documentation, and Preparation Standards](https://pe.usps.com/text/dmm300/203.htm): “Generally, documentation is required from a mailer when a mailing is presented to the USPS as follows: … Documentation describes the preparation, price levels, and content of the mailing; details the volume and postage data; and, by comparison with the actual mailing it describes, supports the claims contained on the postage statement accompanying the mailing and allows the USPS to verify its accuracy. … Bundles must be secured with two or more cross-strapped bands or shrink-wrapped with one or more cross-strapped bands that encircle the length and girth of the bundle at least once. Banding includes plastic bands, and similar material. Using twine/string, rubber bands, wire, or metal banding is not allowed. … Banding tension must be sufficient to tighten and depress the edges of the bundle. Loose banding is not allowed. … Bundles up to 1 inch thick must be secured with appropriate banding placed once around the girth (narrow dimension). Bundles over 1 inch thick must be secured with at least two bands, one around the length and one around the girth. … Documentation must be produced by software certified under the Presort Accuracy Validation and Evaluation (PAVE) program or the Manifest Analysis and Certification (MAC) program, appropriate for the accompanying class of mail and price claimed, or the documentation must be prepared as standardized documentation. … Intelligent Mail Tray labels must be used on all trays and sacks for mailings entered under the full-service automation option … A bundle is a group of addressed pieces secured together as a unit. … all pieces in a bundle must be “faced” (arranged with the addresses in the same read direction), with an address visible on the top piece. … Letter-size mailings must be prepared in letter trays with sleeves. … Each tray must be covered (with the green side of the lid facing up for First-Class Mail and the white side facing up for Periodicals and USPS Marketing Mail). … The weight of a tray and its content must not exceed 70 pounds. … The weight of a sack and its content must not exceed 70 pounds. … The following colors and characters apply to bundle labels as applicable (not all presort levels apply to all classes of mail): … Firm (Periodicals use only), blue Label F. … 5-digit scheme presort level, red Label 5 SCH. … 5-digit presort level, red Label 5. … 3-digit scheme presort level, green Label 3 SCH. … 3-digit presort level, green Label 3. … SCF presort level, pink Label A. … Mixed presort level, tan Label X. … Line 1 must contain only the information specified by standard, including the appropriate destination facility prefix (e.g., “SCF”). … This line must show the class and processing category of the mail in the tray and other information as specified by standards. … Line 3 must show the city and state of the entry Post Office, or the mailer’s name, and the city and state of the mailer’s location. … Documentation produced by PAVE-certified or MAC-certified software is considered standardized documentation. … If a mailing is prepared using an MLOCR/barcode sorter and is submitted with standardized documentation, then pieces do not have to be grouped by 3-digit ZIP Code prefix (or by 3-digit scheme, if applicable) in SCF trays, or by SCF in mixed trays. … The postmaster of the office of mailing may require additional information if the documentation submitted does not allow the corresponding mailing to be verified. … Failure to provide information is sufficient reason for the USPS to refuse a mailing. … Illegible labels are not acceptable.” [^13]: [DMM 705: Advanced Preparation and Special Postage Payment Systems](https://pe.usps.com/text/dmm300/705.htm): “Pallets must measure 48 by 40 inches and must allow four-way entry by forklift trucks and two-way entry by pallet jacks. … The maximum weight (mail and pallet) is 2,200 pounds. … The maximum height of a single pallet (mail and pallet) is 77 inches for bundles, parcels, sacks, flat trays, or pallet boxes, or 77 inches or 12 layers of trays (whichever occurs first) for letter trays. … Pallets may be stacked two to six tiers high if: … The combined gross weight of the stacked pallets (pallets, top caps, and mail) does not exceed 2,200 pounds. … The combined height of the stacked pallets and their loads does not exceed 84 inches. … Mailers must use PAVE-certified presort software to prepare mailings using bundle reallocation. … (Bundle reallocation is optional, but if performed, it must be done for the complete mailing job.) … A mailer who cannot meet the minimum palletization standards without copalletizing, combining, or commingling mixed price mailings might still qualify if the total copalletized, combined, or commingled mailing meets minimum pallet standards. … Unless excepted by standard, the presort level of each bundle (other than carrier route bundles) must be identified either with an optional endorsement line or with a barcoded pressure-sensitive bundle label. … Pallets must be made of high-quality material that can hold loads equal to a gross weight of 2,200 pounds. … Securing with at least two straps or bands of appropriate material. … Wrapping with stretchable or shrinkable plastic. … Securing with at least two straps or bands of appropriate material and wrapping with stretchable or shrinkable plastic. … Each pallet of trays must be secured with stretchable or shrinkable plastic. The use of straps or bands alone is not permitted. … The following standards apply to Periodicals, USPS Marketing Mail, Parcel Select, and Package Services, except Parcel Select mailed at DSCF and DDU prices: … Mailers must prepare a pallet to the required sortation level(s) for the class of mail when a mailing contains 500 or more pounds of bundles, sacks, flat trays, or parcels or 72 linear feet or six layers of letter trays for the destination. … In a single mailing, the minimum load per pallet is 250 pounds of bundles, parcels, or sacks, except as provided in items 2 through 4 below. … There is no minimum load for pallets entered at a destination delivery unit (DDU) or destination sorting and delivery center (DS&DC) if the mail on those pallets is for that unit‘s service area. … First-Class Mail palletization is optional, but mailers using this option must prepare pallets in the sequence listed below and complete each required level before preparing the next optional or required level. … Mailers may palletize First-Class Mail according to a local customer/supplier agreement … When available and with approval by the plant manager of the origin facility, mailers may use all-purpose containers (APCs) or other USPS-approved containers. … Pallet sortation is sequential from the lowest (finest) level to the highest and must be completed at each required level before the next optional or required level is prepared. … Two labels must be affixed to each pallet, one on each adjacent side, and must be visible, including on multiple stacked pallets. … Pallet labels must be pink for Periodicals and white for First-Class Mail, USPS Marketing Mail (including Heavy Printed Matter), Package Services, and Parcel Select. … Labels bearing Intelligent Mail container barcodes must be placed on the outside of the shrinkwrap or plastic. … To combine more than one Periodicals publication on pallets, the mailer must merge and presort copies of all the publications into common bundles to achieve the finest presort level for the combined mailing. … To copalletize different Periodicals flat-size publications, the mailer must consolidate on pallets all independently sorted bundles for each publication to achieve the finest presort level for the mailing. … To copalletize different USPS Marketing Mail flat-size mailings, the mailer must consolidate on pallets all trays or bundles from each mailing to achieve the finest presort level for the mailing … may not always result in all bundles being placed on the finest pallet level possible. … Postage for copalletized mailings of flat-size Periodicals must be paid at the consolidator‘s site. … Authorized mailers may combine USPS Marketing Mail flats, Bound Printed Matter flats, and Periodicals flats in a single mailing as follows: … Mailers must prepare pieces in bundles on pallets. … The Postal Service processes combined mailings of USPS Marketing Mail, Bound Printed Matter, and Periodicals flats to the service standards of USPS Marketing Mail. … Copalletized, combined, or mixed-price level palletized mailings of letter-size or flat-size pieces must be prepared under the standards for the class of mail, subject to specific authorization by Business Acceptance Solutions when required. … The request must be received at least 30 days before the first mailing and include the names, addresses, and telephone numbers of the mail owner and of the firm or person preparing the mail … A mailer is suspended from the pallet program if the mailer’s pallets continue to fail to meet the minimum load integrity levels after being notified and allowed to make changes.” [^14]: [Publication 32: Glossary of Postal Terms](https://postalpro.usps.com/mnt/glusterfs/2016-04/pub32_glossary.pdf#page=181), page 177: “A voluntary certification program in which USPS tests vendors’ presort software to determine its accuracy in sorting address information according to postal requirements and in producing standardized documentation.” [^15]: [Publication 32: Glossary of Postal Terms](https://postalpro.usps.com/mnt/glusterfs/2016-04/pub32_glossary.pdf#page=134), PDF page 134: “A voluntary certification program in which USPS tests vendors’ manifest software to determine its accuracy in calculating postage and fees and producing listings of mailpieces, facsimile postage statements, and other documentation meeting applicable standard.” [^16]: [Publication 32: Glossary of Postal Terms](https://postalpro.usps.com/mnt/glusterfs/2016-04/pub32_glossary.pdf#page=54), page 50: “To combine and present together on pallets mail from two or more different or separately generated production streams.” [^17]: [Publication 32: Glossary of Postal Terms](https://postalpro.usps.com/mnt/glusterfs/2016-04/pub32_glossary.pdf#page=49), page 45: “To integrate dissimilar mail (such as subscriber and nonsubscriber copies, machinable and irregular parcels) into the same mailing.” [^18]: [Mail.xml Technical Specifications R65.0.0.0 ](https://postalpro.usps.com/mnt/glusterfs/2026-10/eDoc-XML-Tech_Spec.pdf#page=33), page 33: “The only noted difference between commingled and combined mailings is that for a commingled mailing, the USPS requires a minimum of 150 pieces per zip code to achieve five-digit postal rates, whereas a combined mailing has no such requirement.” [^19]: [A Guide to Full Service](https://postalpro.usps.com/mnt/glusterfs/2018-03/AGuidetoFullService.pdf#page=52), page 46: “The term ‘handling unit’ describes the equipment (bundles, sacks, trays, and tubs) used to carry mailpieces that have been sorted to a price level for a ZIP Code destination. … the equipment (bundles, sacks, trays, and tubs) used to carry mailpieces that have been sorted to a price level for a ZIP Code destination … MLOCR-origin and Continuous Presort mailings often have physical handling units with the same presort level and ZIP Code destination. … Since mailers can’t identify which of the units a given mailpiece is sorted into, they group them into one ‘logical handling unit’, and associate the pieces to it.” [^20]: [A Guide to Full Service](https://postalpro.usps.com/mnt/glusterfs/2018-03/AGuidetoFullService.pdf#page=53), page 47: “The term ‘mail container’ covers the pallets, Gaylord’s, and all-purpose containers (APC), etc. which carry sets of handling units. … Two types of Full-Service mailing containers are identified in e-docs: physical and logical.” [^21]: [Publication 32: Glossary of Postal Terms](https://postalpro.usps.com/mnt/glusterfs/2016-04/pub32_glossary.pdf#page=116), PDF page 116: “A strip of paper or cardstock (machine-printed singly or in multiples) used to identify mail in containers by showing destination line (office of distribution and ZIP Code), content line (mail class or product, mail processing category, sortation level, and barcoding), and origin line (city and state entry Post Office or mailer’s name and city and state of mailer). … A strip of paper or cardstock (machine-printed singly or in multiples) used to identify mail in containers by showing destination line (office of distribution and ZIP Code), content line (mail class or product, mail processing category, sortation level, and barcoding), and origin line (city and state entry Post Office or mailer’s name and city and state of mailer). The label is placed in label holders on pouches, sacks, trays, and on pallets and other types of mail transport equipment.” [^22]: [Publication 685: Publication for Streamlined Mail Acceptance for Letters and Flats](https://about.usps.com/publications/pub685.pdf#page=15), PDF page 15: “The Postal Service offers the mailing industry two options for automation discounts: Basic Service and Full-Service. … Full-Service combines the use of unique barcodes on each container, tray and mailpiece with electronic submission of postage statements and documentation.” [^23]: [Labeling Lists Technical Guide](https://postalpro.usps.com/mnt/glusterfs/2026-01/Labeling_Lists_Technical_Guide.pdf#page=3), page 2: “Subject to the standards for the price claimed, pieces for the 3-digit ZIP Code prefixes shown in Column A must be combined and labeled to the corresponding ADC destination shown in Column B. … L004 describes the service area by individual 3-digit ZIP Code prefix for mail destined to an area distribution center (ADC).” [^24]: [Publication 32: Glossary of Postal Terms](https://postalpro.usps.com/mnt/glusterfs/2016-04/pub32_glossary.pdf#page=51), page 47: “A mailing agent who aggregates mailings into a single mailing, especially plant-verified drop shipment (PVDS) mailings, prepared by individual mailers and cleared at the origin office. … The consolidator then transports the aggregated mailing for entry at a destination facility such as a sectional center facility.” [^25]: [Publication 32: Glossary of Postal Terms](https://postalpro.usps.com/mnt/glusterfs/2016-04/pub32_glossary.pdf#page=73), page 69: “Typically the movement of a mailer’s product on private (nonpostal) transportation from the point of production to a postal facility located closer to the destination of that product. … The pieces in a mailer’s drop shipment mailings frequently receive a reduced price or discount based on mail class or product.” [^26]: [DMM 235: Commercial First-Class Mail, Mail Preparation](https://pe.usps.com/text/dmm300/235.htm): “*5-digit:* the delivery address on all pieces includes the same 5-digit ZIP Code. … *Mixed:* the pieces are for delivery in the service area of more than one SCF, etc.” [^27]: [Federal Register: New Mailing Standards for Domestic Mailing Services Products (91 FR 33030, Jun 2, 2026)](https://www.govinfo.gov/content/pkg/FR-2026-06-02/html/2026-11003.htm): “The price adjustments and DMM revisions are scheduled to become effective on July 12, 2026. … The Postal Service will remove ADC/AADC rates for First-Class Mail, USPS Marketing Mail, and Periodicals and replacing with 3-Digit rates. … In addition, nomenclature will be revised to label ``Mixed ADC'', ``Mixed AADC'', and ``Mixed NDC'' as ``Mixed'' for First-Class, USPS Marketing Mail, and Periodicals.” [^28]: [Publication 32: Glossary of Postal Terms](https://postalpro.usps.com/mnt/glusterfs/2016-04/pub32_glossary.pdf#page=203), page 199: “Typically, a scheme sort lets mailers combine pieces addressed to two or more 5-digit or 3-digit ZIP Code areas in the same bundle or container rather than a separate bundle or container for each different ZIP Code.” [^29]: [Publication 32: Glossary of Postal Terms](https://postalpro.usps.com/mnt/glusterfs/2016-04/pub32_glossary.pdf#page=90), page 86: “The five-digit ZIP Code groupings are identified in the City State product or a specified labeling list.” [^30]: [Labeling Lists Technical Guide](https://postalpro.usps.com/mnt/glusterfs/2026-01/Labeling_Lists_Technical_Guide.pdf#page=5), page 4: “L012: 5-Digit ZIP Scheme Combination … 5-digit ZIP Scheme Combinations labeling list will enable qualification for 5-digit automation prices for letters by providing grouping of ZIP Codes to combine mailings that would appear in a single tray.” [^31]: [Publication 32: Glossary of Postal Terms](https://postalpro.usps.com/mnt/glusterfs/2016-04/pub32_glossary.pdf#page=140), PDF page 140: “(1) A presort level in which all pieces in the bundle or container are addressed for delivery within the service areas of more than one area distribution center (ADC).” [^32]: [Labeling List Changes Effective November 1, 2026](https://postalpro.usps.com/mnt/glusterfs/2026-09/LabelListChanges_November2026_Final.pdf#page=3), PDF page 3: “L004 3-Digit ZIP Code Prefix Groups - ADC Sortation … No Changes to L004” [^33]: [Labeling List Changes Effective November 1, 2026](https://postalpro.usps.com/mnt/glusterfs/2026-09/LabelListChanges_November2026_Final.pdf#page=1), PDF page 1: “Mailers are expected to label according to these revised lists for mailings inducted on or after the November 1, 2026, effective date through December 31, 2026, expiration date.” [^34]: [Publication 32: Glossary of Postal Terms](https://postalpro.usps.com/mnt/glusterfs/2016-04/pub32_glossary.pdf#page=201), page 197: “(1) A container generally used to transport flat-size mail, parcels, and loose pack mail. … (1) A container generally used to transport flat-size mail, parcels, and loose pack mail. It is made of sewn fabric (usually nylon, polyester, canvas, or plastic with an opening at one end) and is closed with a draw cord and fastener. (2) In mail processing or dispatch functions, to place mail in a sack.” [^35]: [Mailer's Technical Advisory Committee - Best Practices for ACS™](https://postalpro.usps.com/mnt/glusterfs/2022-05/ACS_BestPractices.pdf#page=44), page 44: “A series of specific printed characters on the top line of the address block that identifies the sortation level of a bundle and may contain an ACS participant code. … Equipment used by mail service providers that applies a barcode and presorts mail, enabling the mail owner to take advantage of automation discounts.” [^36]: [Publication 32: Glossary of Postal Terms](https://postalpro.usps.com/mnt/glusterfs/2016-04/pub32_glossary.pdf#page=119), page 115: “A flat cardboard or plastic container for sorted letter-size mail that can hold several hundred letters. Various kinds and sizes of trays are used in place of sacks or pouches for transporting mail within and between major postal facilities. Certain price categories, especially automation prices, require the use of trays.” [^37]: [Publication 32: Glossary of Postal Terms](https://postalpro.usps.com/mnt/glusterfs/2016-04/pub32_glossary.pdf#page=93), page 89: “A four-sided tray used in both mechanized and nonmechanized facilities for flat-size mail that may be secured on top with a separate lid and strapping. It is much taller and shorter than a letter tray.” [^38]: [Mail.dat Technical Specifications R65.0.0.0](https://postalpro.usps.com/mnt/glusterfs/2026-10/USPS_Mail_dat_Tech_Spec.pdf#page=174), page 174: “The CSA is a joint agreement created with a specific mailer at a specific location that defines palletization rules and entry locations for that mailer’s First-Class volume.” [^39]: [Guide to eInduction](https://postalpro.usps.com/mnt/glusterfs/2026-08/375_Guide-to-eInduction_1.pdf#page=12), page 11: “A logical pallet is created in the eDoc for a given destination and presort level.” [^40]: [A Guide to Full Service](https://postalpro.usps.com/mnt/glusterfs/2018-03/AGuidetoFullService.pdf#page=59), page 53: “the term used to describe the mail containers (pallet, Gaylord, all-purpose container, etc.) used to carry an aggregate of handling units” [^41]: [Publication 32: Glossary of Postal Terms](https://postalpro.usps.com/mnt/glusterfs/2016-04/pub32_glossary.pdf#page=98), PDF page 98: “A wheeled multipurpose container constructed of square steel tubing and sheet steel material that is nestable (i.e., it can be stored in an L-shaped configuration) and is used to transport, stage, and distribute sacks, trays, and bundles. More than 5 feet tall, with a maximum cargo load of 1,200 pounds, the container can be pushed by hand or pulled by tractor. Two fold-back shelves are provided (one on the bottom and one halfway up) to separate the load in the container if required. The GPMC has retractable doors that, when closed, make the container a full container, protecting the mail and preventing mail from falling from the GPMC in transit.” [^42]: [Publication 32: Glossary of Postal Terms](https://postalpro.usps.com/mnt/glusterfs/2016-04/pub32_glossary.pdf#page=161), page 157: “A reusable platform or skid on which mail is stacked to be moved as a single unit. Pallets are made of rigid material such as wood or plastic designed for four-way forklift entry and capable of handling loads of up to 65 cubic feet and 2,200 pounds. A USPS pallet measures 48 by 40 inches.” [^43]: [Publication 32: Glossary of Postal Terms](https://postalpro.usps.com/mnt/glusterfs/2016-04/pub32_glossary.pdf#page=97), page 93: “A pallet-size box used for shipping mail in bulk quantities. It is usually constructed of triple wall corrugated fiberboard that fits on standard pallets. The first triple-wall corrugated pallet boxes were manufactured by the Gaylord Container Corporation.” [^44]: [Labeling Lists Technical Guide](https://postalpro.usps.com/mnt/glusterfs/2026-01/Labeling_Lists_Technical_Guide.pdf#page=4), page 3: “L005 describes the service area by individual 3-digit ZIP Code prefix for First-Class, USPS Marketing Mail, and Periodical letters mail destined to a sectional center facility (SCF).” [^45]: [Publication 32: Glossary of Postal Terms](https://postalpro.usps.com/mnt/glusterfs/2016-04/pub32_glossary.pdf#page=143), page 139: “An abbreviation used on mail container labels that identifies the contents as mixed mail for different destinations processed at a single facility (such as for multiple ADCs). Mail in such containers is generally residual mail that USPS combines with other residual mail to achieve sufficient volumes for processing and dispatch.” [^46]: [Publication 32: Glossary of Postal Terms](https://postalpro.usps.com/mnt/glusterfs/2016-04/pub32_glossary.pdf#page=239), page 235: “An abbreviation used on mail container labels that identifies the contents as mail requiring sorting and distribution (“working”) by USPS.” [^47]: [Publication 32: Glossary of Postal Terms](https://postalpro.usps.com/mnt/glusterfs/2016-04/pub32_glossary.pdf#page=216), page 212: “A report that shows a complete breakdown of a mailing, including piece counts by price, that supports the claims on the postage statements accompanying the mailing. … A report that shows a complete breakdown of a mailing, including piece counts by price, that supports the claims on the postage statements accompanying the mailing. The report contains specific data presented in a uniform format.” [^48]: [Publication 32: Glossary of Postal Terms](https://postalpro.usps.com/mnt/glusterfs/2016-04/pub32_glossary.pdf#page=47), page 43: “(1) A mailing in which individually addressed mailpieces of the same mail class and generally of the same price category are merged and sorted together, usually using two or more postage payment methods.” [^49]: [Mail.dat Technical Specifications R65.0.0.0](https://postalpro.usps.com/mnt/glusterfs/2026-10/USPS_Mail_dat_Tech_Spec.pdf#page=181), page 181: “The third-party Copal process (also known as external copalletization) is defined as an operation where mail is moving from the origin mailers mailing facility to a consolidators mailing facility for consolidation. … Third party Copal requires knowing exactly which piece is in which bundle or tray and which bundle or tray is on which pallet to populate the consolidator submission successfully.” [^50]: [A Guide to Full Service](https://postalpro.usps.com/mnt/glusterfs/2018-03/AGuidetoFullService.pdf#page=51), page 45: “Mail.dat is an industry-defined database structure consisting of files linked by key fields.” [^51]: [Mail.dat Technical Specifications R65.0.0.0](https://postalpro.usps.com/mnt/glusterfs/2026-10/USPS_Mail_dat_Tech_Spec.pdf#page=185), page 185: “A .seg Class Defining Preparation value of 6 = Std/Bound Printed Matter/Periodicals Co-Mailings indicates the mailing contains several of the following: Standard Mail, Package Services, and Periodicals.” [^52]: [A Guide to Full Service](https://postalpro.usps.com/mnt/glusterfs/2018-03/AGuidetoFullService.pdf#page=28), page 22: “Sorts bundles to the sack level (the ‘virtual sack’);” [^53]: [A Guide to Full Service](https://postalpro.usps.com/mnt/glusterfs/2018-03/AGuidetoFullService.pdf#page=26), page 20: “The e-documentation indicates at the virtual sack level which bundles will be sent to a consolidator for copalletization;” [^54]: [Publication 685: Publication for Streamlined Mail Acceptance for Letters and Flats](https://about.usps.com/publications/pub685.pdf#page=95), PDF page 95: “An Unlinked Copal Error is logged when a tray/virtual sack is marked for copalletization at origin but no eDoc is submitted with the tray/virtual sack on a pallet.” [^55]: [Publication 685: Publication for Streamlined Mail Acceptance for Letters and Flats](https://about.usps.com/publications/pub685.pdf#page=29), PDF page 29: “It is a requirement that the consolidator provide documentation within 14 days of the mailing date of the original eDoc to properly identify the linkage of the trays or sacks to the container.” [^56]: [Publication 685: Publication for Streamlined Mail Acceptance for Letters and Flats](https://about.usps.com/publications/pub685.pdf#page=30), PDF page 30: “For handling unit errors, the assessment applies to all Full-Service pieces nested to the handling units with errors above the error threshold. … The assessment amount is equal to the removal of the Full-Service discount” [^57]: [Mail.dat Technical Specifications R65.0.0.0](https://postalpro.usps.com/mnt/glusterfs/2026-10/USPS_Mail_dat_Tech_Spec.pdf#page=370), PDF page 370: “Date Data Type Error: Presort Labeling List Effective Date must be a valid date formatted as YYYYMMDD in the .csm file.” --- Unofficial. Not affiliated with or endorsed by the United States Postal Service. This is https://postalref.com/guides/presort as Markdown.