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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 rate 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. Not all presort levels are applicable in all situations. [M011.1.1]
a. General. A mailing is a group of pieces within the same class of mail and, except for certain parcel rates, the same processing category that may be sorted together and/or presented under a single minimum volume mailing requirement under the applicable standards. Generally, types of mail that follow different flows through the postal processing system (e.g., automation, nonautomation carrier route, and other nonautomation) and mail for each separate class and subclass must be prepared as a separate mailing. Other specific standards may define whether separate mailings may be combined, palletized, reported, or deposited together.
b. Media Mail and any other type of mail may not be part of the same mailing even if in the same processing category. [M011.1.4]
Terms used for presort levels are defined as follows:
a. 5‑digit: the delivery address on all pieces includes the same 5‑digit ZIP Code.
b. 5‑digit scheme (pallets and sacks) for Media Mail parcels: the ZIP Code in the delivery address on all pieces begins with one of the 5‑digit ZIP Code zones processed by the USPS as a single scheme, as shown in L606.
c. 3‑digit: the ZIP Code in the delivery address on all pieces begins with the same three digits (see L002, Column A).
d. ADC: all pieces are addressed for delivery in the service area of the same area distribution center (ADC) (see L004).
e. ASF/BMC: all pieces are addressed for delivery in the service area of the same auxiliary service facility (ASF) or bulk mail center (BMC) (see L601, L602, or L605).
f. Mixed [BMC, ADC, etc.]: the pieces are for delivery in the service area of more than one BMC, ADC, etc.
g. Residual pieces/bundles/sacks contain material remaining after completion of a presort sequence. Residual mail lacks the volume set by standard to require or allow bundle preparation to a particular destination, and usually does not qualify for a presort rate. Residual mail is also referred to as nonqualifying or working mail. [M011.1.2]
For purposes of preparing mail:
a. Pieces refers to individually addressed mailpieces. This definition also applies when pieces is used in eligibility standards. Quantities indicated for optional or required sortations always refer to pieces unless specifically excepted.
b. A full sack is defined in the standards for the class and rate claimed.
c. A 5‑digit scheme sort for Media Mail parcels yields 5‑digit scheme sacks or pallets for those 5‑digit ZIP Codes listed in L606 and 5‑digit sacks or pallets for other ZIP Codes. The 5‑digit ZIP Codes in each scheme are treated as a single presort destination subject to a single minimum volume (if required), with no further separation by 5‑digit ZIP Code required. Sacks or pallets prepared for a 5‑digit scheme destination that contain pieces for only one of the schemed 5‑digit ZIP Codes are still considered 5‑digit scheme sorted and are labeled accordingly. The 5‑digit scheme sort is always optional, including when 5‑digit sortation is required for rate eligibility. The 5‑digit scheme sort need not be used for all possible 5‑digit scheme sorts.
d. The required at [quantity] instruction (e.g., "required at 10 pieces") means that the particular unit must be prepared for the corresponding presort level whenever the specified quantity of mail is reached or exceeded. Bundles and containers may contain more than the specified required at quantity up to the applicable maximum physical size. Subject to applicable rate eligibility standards, smaller quantities may be prepared only if permitted. Where specified by standard, required preparation applies only if the mailer chooses to qualify for the corresponding rate.
e. The optional at [quantity] instruction means that the particular unit may be prepared for the corresponding presort level whenever the specified quantity of mail is reached or exceeded. Bundles or containers may contain more than the specified optional at quantity up to the applicable maximum physical size. Smaller quantities may be prepared only if permitted by applicable rate eligibility standards. Standards for quantities with which preparation is optional are often followed by standards for larger quantities with which preparation is required.
f. Entry [facility] (or origin [facility]) refers to the USPS mail processing facility (e.g., "entry BMC") that serves the post office at which the mail is entered by the mailer. If the post office where the mail is entered is not the one serving the mailer's location (e.g., for plant‑verified drop shipment), the post office of entry determines the entry facility. Entry BMC includes subordinate ASFs unless otherwise specified.
g. The group pieces instruction means the pieces are to be sorted together as if to be bundled but not actually secured into a bundle. Bundle labels and other bundle identification methods may be used for unsecured groups of pieces as permitted by standard.
h. A bundle is a group of addressed pieces secured together as a unit. The presort process considers the total number of pieces available for the particular presort destination and assembles them into groups meeting applicable volume and size standards. When the standards for the rate claimed require securing the pieces in each group together, the result is a bundle. Bundle preparation is described in 2.0.
i. A "logical" presort destination represents the total number of pieces that are eligible for a specific presort level based on the required sortation, but which might not be contained in a single bundle or in a single container (i.e., sack, pallet) due to applicable preparation requirements or the size of the individual pieces. [M011.1.3]
A bundle is a group of addressed pieces secured together as a unit. The presort process considers the total number of pieces available for the particular presort destination and assembles them into groups meeting applicable volume and size standards. When the standards for the rate claimed require securing the pieces in each group together, the result is a bundle. Bundle preparation is described in 2.0. [M011.1.3z]
All pieces in a bundle must be "faced" (i.e., arranged with the addresses in the same read direction), with an address visible on the top piece. [M020.1.1]
Bundles of pieces of nonuniform thickness may be prepared by counter‑stacking under these conditions:
a. Counter‑stacking should be used only to create bundles of more uniform thickness that are more likely to maintain their integrity during transportation and processing.
b. Counter‑stacking is appropriate for saddle‑stitched mailpieces and pieces where one edge is thicker than other edges or one corner is thicker than other corners.
c. When counter‑stacking, pieces must all have addresses facing up and be divided into no more than four approximately equal groups, with each group rotated 180 degrees from the preceding and succeeding group(s); prepare as few groups as possible to create a bundle of uniform thickness.
d. Counter‑stacked groups within a bundle should be as thick as possible, generally at least 1 inch thick.
e. When pieces are nonuniform in thickness because they are thicker in the center instead of along an edge or corner, counter‑stacking will generally not result in a bundle of uniform thickness (i.e., a football‑shaped bundle would be created). Instead of counter‑stacking such pieces, limit the height (thickness) of the bundle to 3 to 6 inches to ensure the bundle will stay together during normal transit and handling. [M020.1.2]
Bundle preparation is subject to the following requirements:
a. Bundles must be able to withstand normal transit and handling without breakage or injury to USPS employees.
b. Bundles must be secured with banding, shrinkwrap, or shrinkwrap plus one or more bands. Banding includes plastic bands, rubber bands, twine/string, and similar material. Use of wire or metal banding is not permitted.
c. When one band is used, it must be placed tightly around the girth (narrow dimension).
d. Bundles over 1 inch high (thick) must be secured with at least two bands or with shrinkwrap. When double banding is used to secure bundles, it must encircle the length and girth of the bundle at least once. Additional bands may be used if none lies within 1 inch of any bundle edge.
e. Banding tension must be sufficient to tighten and depress the edges of the bundle so pieces will not slip out of the banding during transit and processing. Loose banding is not allowed.
f. When twine/string is used to band bundles, the knot(s) must be secure so the banding does not come loose during transit and processing. [M020.1.4]
Each logical bundle (the total group of pieces for a bundle destination) of Media Mail must meet the applicable minimum and maximum bundle size standards in 5.0, Preparation for Media Mail Parcels, and 705.8.0, Preparation for Pallets. The pieces in the logical bundle must then be secured in a physical bundle or bundles. Wherever possible, each physical bundle for a logical bundle destination should contain at least the minimum bundle size. The size of each physical bundle for a specific logical bundle destination may, however, contain the exact bundle minimum, more pieces than the bundle minimum, or fewer pieces than the bundle minimum depending on the size of the pieces in the mailing or the total quantity of the pieces to that destination. Unless otherwise noted, the maximum weight for bundles in sacks is 20 pounds. Bundles prepared on pallets must meet the additional bundling requirements under 705.8.0 and each physical bundle, including carrier route rate mail, must always contain at least two pieces. [M020.1.6]
An individual bundle may be prepared with fewer than the minimum number of pieces required by the standards for the rate claimed without loss of rate eligibility under either of these conditions:
a. A greater number of pieces would exceed the maximum physical size for a bundle and the total number of pieces for that presort destination meets the minimum volume standard (e.g., 30 pieces are available to meet a 10‑piece minimum, but a bundle of eight pieces is 6 inches thick).
b. The pieces constitute the "last bundle" for a presort destination and previously prepared bundles met the applicable minimum volume standard (e.g., 505 pieces prepared in 10 50‑piece bundles and one five‑piece bundle). [M020.1.7]
The presort level of each bundle must be identified either with an optional endorsement line under 708.7.0 or with a barcoded pressure‑sensitive bundle label. The label may be placed anywhere on the address side of the top piece in the bundle. Bundle labels must not be obscured by banding or shrinkwrap. The following colors and presort characters apply to bundle labels:
a. Five‑digit presort level, red Label 5.
b. Three‑digit presort level, green Label 3.
c. ADC presort level, pink Label A.
d. Mixed ADC presort level, tan Label X. [M020.1.3]
An optional endorsement line (OEL) may be used to label bundles instead of applying pressure‑sensitive bundle labels or facing slips to the top piece under 708.7.0. [M013.1.1]
All sack preparation is subject to these standards:
a. Each sack must bear the correct sack label.
b. The weight of a sack and its content must not exceed 70 pounds. [M033.2.4]
Only sack labels may be used for sacks. Machine‑printed labels (available from the USPS) ensure legibility. Legible hand‑printed labels are acceptable. Illegible labels are not acceptable. [M031.1.1]
A sack label must meet these specifications:
b. Length (parallel to printing): 3.250 inches minimum; 3.375 inches maximum.
c. Height (perpendicular to printing): 0.937 inch minimum; 0.980 inch maximum. [M031.2.1]
Line 1 (destination line) must meet these standards:
a. Placement. Line 1 must be the first visible line on the label. It must be completely visible and legible when placed in the label holder. This visibility is ensured if the top of this line is no less than 1/8 (0.125) inch below the top of the label when the label is cut and prepared.
b. Information. Line 1 must contain only the information specified by standard, including the appropriate destination facility prefix (e.g., "ADC"). Two zeros may follow the 3‑digit ZIP Code prefix required by labeling standards (e.g., 223 as 22300).
c. Overseas Military Mail. On 5‑digit sacks and trays for overseas military destinations, Line 1 shows, from left to right, "APO" or "FPO," followed by "AE" (for ZIP Codes within the ZIP Code prefix range 090‑098), "AA" (for ZIP Codes within the 3‑digit ZIP Code prefix 340), or "AP" (for ZIP Codes within the ZIP Code prefix range 962‑966), followed by the destination 5‑digit ZIP Code of the mail in the sack or tray. [M031.1.2]
Line 2 (content line) must meet these standards:
a. Placement: Line 2 must be the second visible line on the label. This line must show the class and processing category of the mail in the sack or tray and other information as specified by standards. [M031.1.3]
b. Codes: The codes shown below must be used as appropriate on Line 2 of sack labels.
Line 3 (office of mailing or mailer information line) must be the bottom line of required information and must show either the city and state of the entry post office or the mailer's name and the city and state of the mailer's location. It is recommended that the mailer's name also appear with the city and state of the entry post office. [M031.1.4]
Lines 1 and 3 may contain abbreviated information if such abbreviations are those in the USPS City State Product or in Publication 65, National Five‑Digit ZIP Code and Post Office Directory. [M031.1.6]
Extraneous information is not permitted on the destination and content lines. It may be placed away from required lines, subject to these conditions:
a. It may be placed above Line 1 in not more than 0.083 inch high type (6‑point type).
b. It may appear to the right of required Line 3 information but it must not consist of numerals that resemble a ZIP Code or 3‑digit ZIP Code prefix.
c. It must not appear between Lines 1 and 2 (a blank line is permitted), but may appear between Lines 2 and 3 if it does not consist of numerals that resemble a ZIP Code or 3‑digit ZIP Code prefix.
d. It may appear below Line 3.
e. A mailer code assigned by the USPS or such words as "Mailer," "From" (or "FR"), or "Entered at" may appear before the required information on Line 3. [M031.1.5]
Barcoded sack labels are not required on Presorted Media Mail mailings. If used, they must meet these general standards:
a. Barcoded tray labels and sack labels must not be interchanged. Tray labels must be used only for trays, and sack labels must be used only for sacks.
b. Mailer‑produced barcoded labels must meet the standards in 708.6.0.
c. All information on barcoded labels must be machine‑printed. Alterations to preprinted barcoded labels (e.g., handwritten changes) may not be made.
d. Barcoded labels must be inserted completely into the label holder on the tray or sack to prevent their loss during transport and processing. [M032.1.1]
A barcoded sack label must meet these specifications:
b. Reflectance: minimum reflectance requirements in 708.6.3.3i., Barcode.
c. Weight: minimum 70‑pound paper stock (500 sheets, 24 by 36 inches).
d. Height: 0.937 inch minimum; 0.980 inch maximum.
e. Length: 3.250 inches minimum; 3.375 inches maximum. [M032.3.1]
All mailings of Presorted Media Mail are subject to the standards in 5.0 and to these general requirements:
a. Each mailing must meet the applicable rate and eligibility standards in 473 and 1.0 through 4.0 in Mail Preparation.
b. All pieces in a mailing must be within the same processing category as described in 401.1.0. A Media Mail irregular parcel is a piece that is not a machinable parcel as defined in 401.1.5. Pieces that meet the size and weight standards for a machinable parcel but are not individually boxed or packaged to withstand processing on BMC parcel sorters under 601.7.0 also are irregular parcels.
c. All pieces must be sorted to the finest extent possible or palletized under 705.8.0.
d. Each piece claimed at Media Mail rates must be marked "Media Mail." Each piece claimed at Presorted Media Mail rates also must be marked "Presorted" or "PRSRT" under 402.2.0. [M730.1.1]
A sack must be prepared when the quantity of mail for a required presort destination reaches 10 addressed pieces or 20 pounds, whichever occurs first. At the mailer's option, a sack may be prepared when the quantity of mail reaches 1,000 cubic inches. Smaller volumes are not permitted (except in mixed BMC sacks). Sacking also is subject to these conditions:
a. Identical‑weight pieces that weigh 2 pounds or less must be sacked using the 10‑piece minimum; those that weigh more must be sacked using the 20‑pound or 1,000 cubic inch minimum.
b. For nonidentical‑weight pieces, mailers must use either the minimum that applies to the average piece weight for the entire mailing (divide the net weight of the mailing by the number of pieces; the resulting average single‑piece weight determines whether the 10‑piece or 20‑pound minimum applies). Alternately, mailers may sack by the actual piece count, mail weight for each bundle destination, or 1,000 cubic inch minimum, provided that documentation can be provided with the mailing that shows (specifically for each sack) the number of pieces and their total weight.
c. Mailers must note on the postage statement which sacking method was used. [M730.4.1]
Preparation sequence and labeling:
1. Line 1: use L606, Column B.
2. Line 2: "PSVC MACH 5D SCHEME" or "PSVC MACH 5D SCH."
b. 5‑digit: optional, but required for 5‑digit rate eligibility.
1. Line 1: use city, state, and 5‑digit ZIP Code on mail (see 4.3 for overseas military mail).
1. Line 1: use L601, Column B.
d. Mixed BMC: required (no minimum).
1. Line 1: "MXD" followed by the L601, Column B information for the BMC serving the 3‑digit ZIP Code of entry post office.
2. Line 2: "PSVC MACH WKG." [M730.4.2]
The barcoded discount applies to Media Mail machinable parcels (see 401.1.5) that are included in a mailing of at least 50 pieces of Media Mail. The pieces must be entered either at single‑piece rates or basic rates and bear a correct, readable barcode for the ZIP Code shown in the delivery address as required by 708.5.0. The barcoded discount is not available for pieces mailed at 5‑digit rates. [E713.2.0]
A bundle must be prepared when the quantity of addressed pieces for a required presort level reaches a minimum of 10 pieces. Smaller volumes are not permitted except for mixed ADC bundles. Bundling is not required for pieces placed in 5‑digit scheme sacks and 5‑digit sacks when such pieces are enclosed in an envelope, full‑length sleeve, full‑length wrapper, or polybag and the minimum bundle volume is met. The maximum weight of each physical bundle is 20 pounds, except that 5‑digit bundles placed in 5‑digit sacks may weigh a maximum of 40 pounds. Each physical bundle must contain at least two addressed pieces. Bundling is also subject to these conditions:
a. Identical‑weight pieces that weigh 1 pound or less must be prepared using the 10‑piece minimum; those that weigh more than 1 pound must be prepared using the 10‑pound minimum.
b. For nonidentical‑weight pieces, mailers must either use the minimum that applies to the average piece weight for the entire mailing (divide the net weight of the mailing by the number of pieces; the resulting average single‑piece weight determines whether the 10‑piece or 10‑pound minimum applies), or bundle by the actual piece count or mail weight for each sack, if documentation can be provided with the mailing that shows (specifically for each sack) the number of pieces in each bundle and their total weight.
c. Mailers must note on the postage statement which sacking method was used. [M730.3.1]
Preparation sequence, bundle size, and labeling:
a. 5‑digit (optional, but required for 5‑digit rate eligibility); 10‑piece minimum; red Label 5 or optional endorsement line (OEL).
b. 3‑digit (required); 10‑piece minimum; green Label 3 or OEL.
c. ADC (required); 10‑piece minimum; pink Label A or OEL.
d. Mixed ADC (required); no minimum; tan Label X or OEL. [M730.3.2]
A sack must be prepared when the quantity of mail for a required presort destination reaches 10 addressed pieces or 20 pounds, whichever occurs first. At the mailer's option, a sack may be prepared when the quantity of mail reaches 1,000 cubic inches. Smaller volumes are not permitted (except in mixed ADC sacks). Optional 5‑digit scheme sacks may be prepared only when there are at least 10 addressed pieces or 20 pounds. Smaller volumes are not permitted (except in mixed ADC sacks). Sacking is also subject to these conditions:
a. Identical‑weight pieces weighing 2 pounds or less must be sacked using the 10‑piece minimum; those that weigh more must be sacked using the 20‑pound or 1,000 cubic inch minimum.
b. For nonidentical‑weight pieces, mailers must use either the minimum that applies to the average piece weight for the entire mailing (divide the net weight of the mailing by the number of pieces; the resulting average single‑piece weight determines whether the 10‑piece or 20‑pound minimum applies). Alternatively, mailers may sack by the actual piece count, mail weight for each destination, or 1,000 cubic inch minimum, provided that documentation can be provided with the mailing that shows (specifically for each sack) the number of pieces in each sack and their total weight.
c. Mailers must note on the postage statement which sacking method was used. [M730.3.3]
Preparation sequence and labeling:
1. Line 1: use L606, Column B.
2. Line 2: "PSVC IRREG 5D SCHEME" or "PSVC IRREG 5D SCH."
b. 5‑digit: optional, but required for 5‑digit rate eligibility.
1. Line 1: use city, state, and 5‑digit ZIP Code on mail (see 4.3 for overseas military mail).
1. Line 1: use L002, Column A.
1. Line 1: use L004, Column B.
e. Mixed ADC: required (no minimum).
1. [02-03-05] Line 1: "MXD" followed by city, state, and ZIP Code of ADC serving 3‑digit ZIP Code prefix of entry post office, as shown in L004. If placed on an ASF or BMC pallet under option in 705.8.10.4, use L010.