DMM Revision: Removal of Sacks — USPS Marketing Mail and Periodicals Flats Clarification

The Postal Service™ will revise Mailing Standards of the United States Postal Service, Domestic Mail Manual (DMM®), in various sections, to clarify requirements for using flat trays and sacks, when applicable, as a handling unit for USPS Marketing Mail® and Periodicals flats.

These revisions (scheduled to publish in the July 9, 2023, DMM edition) clarify revised standards from Postal Bulletin 22616 (1-26-23, pages 5–23) that published in the January 22, 2023, DMM edition and pertain to using flat trays and sacks. In that edition, the Postal Service removed references to sacks as a handling unit for certain USPS Marketing Mail and Periodicals flats.

This article also includes corrections for section 705.8.10.3d planned for the July 9, 2023, DMM edition. The revisions for that section included in the recently published article “New Mailing Standards for Domestic Mailing Services Products,” in Postal Bulletin 22626 (6-15-23, 4–6), were incorrect.

The Postal Service will publish these revisions in the July 9, 2023, DMM edition, which is expected to post online in the coming weeks. These standards became effective July 9, 2023.

Mailing Standards of the United States Postal Service, Domestic Mail Manual (DMM)

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200 Commercial Mail Letters, Cards, Flats and Parcels

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207 Periodicals

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18.0 General Mail Preparation

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18.4 Mail Preparation Terms

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[Revise the text of item s. to read as follows:]

s. An origin/entry SCF flat tray or sack contains all 5-digit and 3-digit bundles (regardless of quantity) for the SCF in whose service area the mail is verified. At the mailer’s option, such a flat tray/sack may be prepared for the SCF area of each entry Post Office. This presort level applies only to nonletter-size Periodicals prepared in flat trays/sacks.

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20.0 Sacks and Trays

20.1 Basic Standards

20.1.1 General

[Revise the text of 20.1.1 to read as follows:]

Mailings must be prepared in letter trays (letters), flat trays (flats) under 22.7 and 25.5, or sacks (carrier route, 5-digit scheme cr-rt and 5-digit cr-rt flats, nonpalletized residual 5-digit flats entered at a DDU along with carrier route flats, nonpalletized carrier route flats entered at the DSCF (origin), nonpalletized 5-digit flats entered at the DSCF (origin), and nonpalletized 3-digit/SCF flats entered at the DSCF (origin), and all periodicals parcels). DSCF (origin) 5-digit and 3-digit/SCF sacks must be entered at the BMEU and emptied into a designated container. Palletized mail is subject to 705.8.0. See 203.5.0 and 203.6.0 for tray and sack standards.

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22.0 Preparing Nonbarcoded (Presorted) Periodicals

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22.2 Bundle Preparation

[Add a new first sentence to the introductory text of 22.2 to read as follows:]

Bundling in flat trays is optional unless a bundle is more finely presorted than the tray’s presort destination.***

[Revise the current second sentence of the introductory text of 22.2 to read as follows:]

***Prepare a bundle when the quantity of addressed pieces for a required presort level reaches the minimum bundle size.***

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[Revise the title and introductory text of 22.6 to read as follows:]

22.6 Sack Preparation

Sack preparation is allowed only for the following: Parcels; Nonpalletized residual 5-digit flats entered at a DDU along with carrier route flats; Nonpalletized carrier route flats entered at the DSCF (origin); Nonpalletized 5-digit flats entered at the DSCF (origin); and nonpalletized 3-digit/SCF flats entered at the DSCF (origin). DSCF (origin) 5-digit and 3-digit/SCF sacks must be entered at the BMEU and emptied into a designated container. For mailing jobs that also contain a barcoded mailing, see 22.1.2. For other mailing jobs, preparation sequence, sack size, and labeling:

[Revise the text of items a. through d. to read as follows:]

a. 5-digit, required at 72 pieces, optional at 24 pieces minimum.

1. Line 1: use city, state, and 5-digit ZIP Code on mail. (See 21.0 for overseas military mail.)

2. Line 2: use “PER” or NEWS” as applicable; followed by “FLTS” or “IRREG” as applicable; followed by “5D”; followed by “NON BC” for flats.

b. 3-digit, required at 72 pieces, optional at 24 pieces minimum.

1. Line 1: use L002, Column A.

2. Line 2: use “PER” or “NEWS” as applicable; followed by “FLTS” or “IRREG” as applicable; followed by “3D”; followed by “NON BC” for flats.

c. SCF, required at 72 pieces, optional at 24 pieces minimum.

1. Line 1: use L002, Column C.

2. Line 2: use “PER” or “NEWS” as applicable; followed by “FLTS” or “IRREG” as applicable; followed by “SCF”; followed by “NON BC” for flats.

d. Origin/entry SCF, required for the SCF of the origin (verification) office, optional for the SCF of an entry office other than the origin office, (no minimum).

1. Line 1: use L002, Column C.

2. Line 2: use “PER” or “NEWS” as applicable; followed by “FLTS” or “IRREG” as applicable; followed by “SCF”; followed by “NON BC” for flats.

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22.7 Tray Preparation — Flat-Size Nonbarcoded Pieces

[Revise the Introductory text of 22.7 to read as follows:]

Mailers must place machinable and nonmachinable (26.0) flat-sized pieces in flat trays (203.5.6) instead of sacks unless prepared as the following: Direct carrier route; 5-digit scheme carrier route; 5-digit carrier route (23.4.1, 705.9.0, and 705.10.0); Nonpalletized residual 5-digit entered at a DDU along with carrier route flats; Nonpalletized 5-digit flats entered at the DSCF (origin); or nonpalletized 3-digit/SCF entered at the DSCF (origin). Bundling is optional unless a bundle is more finely presorted than the tray’s presort destination. The trays are subject to a container charge and any bundles are subject to a bundle charge. Tray preparation, sequence, and labeling:

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23.0 Preparing Carrier Route Periodicals

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23.4 Preparation — Flat-Size Pieces and Irregular Parcels

[Revise the title of 23.4.1 to read as follows:]

23.4.1 Flat Tray and Sacking Preparation and Labeling

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[Revise the introductory text of item d. to read as follows:]

d. 3-digit carrier routes, required with one 6-piece bundle. Flat-sized pieces must be prepared in flat trays (see 203.5.6).

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[Revise the title and introductory text of 23.4.2 to read as follows:]

23.4.2 Exception to Flat Traying and Sacking

Sacking or traying is not required for carrier route bundles entered at a DDU when the mailer unloads bundles under 29.6.5. Mail presented under this preparation is not subject to the container charge (but is subject to the bundle charge). Mailers must prepare unsacked, untrayed bundles as follows:

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25.0 Preparing Flat-Size Barcoded (Automation) Periodicals

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25.4 Sacking and Labeling

[Revise the text of 25.4 to read as follows:]

Sack preparation is allowed only for nonpalletized residual 5-digit flats entered at a DDU along with carrier route flats, nonpalletized 5-digit flats entered at the DSCF (origin), and nonpalletized 3-digit/SCF flats entered at the DSCF (origin). DSCF (origin) 5-digit and 3-digit/SCF sacks must be entered at the BMEU and emptied into a designated container. For mailing jobs that also contain a machinable nonbarcoded price mailing, see 25.1.9 and 705.9.0. Other mailing jobs are prepared, sacked, and labeled as follows:

a. 5-digit, required at 72 pieces, optional at 24 pieces; fewer pieces not permitted; labeling:

1. Line 1: use city, state, and 5-digit ZIP Code on mail. (See 21.0 for overseas military mail.)

2. Line 2: use “PER FLTS 5D BC” or “NEWS FLTS 5D BC,” as applicable.

b. 3-digit, required at 72 pieces, optional at 24 pieces; fewer pieces not permitted; labeling:

1. Line 1: use L002, Column A.

2. Line 2: use “PER FLTS 3D BC” or “NEWS FLTS 3D BC,” as applicable.

c. SCF, required at 72 pieces, optional at 24 pieces; fewer pieces not permitted; labeling:

1. Line 1: use L002, Column C.

2. Line 2: use “PER FLTS SCF BC” or “NEWS FLTS SCF BC,” as applicable.

d. Origin SCF (required) and entry SCF(s) (optional), no minimum; labeling:

1. Line 1: use L002, Column C.

2. Line 2: use “PER FLTS SCF BC” or “NEWS FLTS SCF BC,” as applicable.

25.5 Tray Preparation — Flat-Size Barcoded Pieces

[Revise the introductory text of 25.5 to read as follows:]

Mailers must place machinable flats (under 201.6.0) in flats trays (see 24.0) instead of sacks unless prepared as the following: Direct carrier route; 5-digit scheme carrier route; 5-digit carrier route; Nonpalletized residual 5-digit and entered at a DDU along with carrier route flats; Nonpalletized 5-digit flats entered at the DSCF (origin); or nonpalletized 3-digit/SCF entered at the DSCF (origin). Mailers must group together all pieces for each 5-digit scheme, 5-digit, 3-digit scheme, 3-digit, SCF, and ADC destination. Bundling is optional unless it achieves a finer presort than the tray’s presort destination. The trays are subject to a container charge and any bundles are subject to a bundle charge. Tray preparation, sequence, and labeling:

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29.0 Destination Entry

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29.4 Destination Sectional Center Facility

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29.4.2 Price Eligibility

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[Add new item c. to read as follows:]

c. Nonpalletized carrier route, 5-digit scheme carrier route, 5-digit carrier route, 5-digit, or 3-digit flats may be prepared in sacks when entered at the DSCF (origin). DSCF (origin) 5-digit and 3-digit/SCF sacks must be entered at the BMEU and emptied into a designated container.

29.5 Destination Delivery Unit

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29.5.2 Price Eligibility

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[Add new item d. to read as follows:]

d. Nonpalletized residual 5-digit flats remaining after a carrier route sortation may be prepared in sacks and deposited at the DDU along with a carrier route mailing.

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240 Commercial Mail USPS Marketing Mail

243 Prices and Eligibility

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6.0 Additional Eligibility Standards for Enhanced Carrier Route USPS Marketing Mail Letters and Flats

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6.5 High Density and High Density Plus (Enhanced Carrier Route) Standards — Flats

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6.5.4 High Density Plus Carrier Route Bundles on a 5-digit/Direct Container (High Density Plus-CR Bundles/Container Discount Eligibility) — Flats

[Revise the text of 6.5.4 to read as follows:]

The High Density Plus-CR Bundles/Container discount applies to 300 or more High Density Plus-eligible pieces that are palletized under 705.8.0, 705.10.0, 705.12.0, or 705.13.0 on a 5-digit merged, 5-digit (scheme) merged, 5-digit carrier route, 5-digit carrier routes, or 5-digit scheme carrier route pallet entered at an Origin (None), DNDC, DSCF, or DDU entry, or in a carrier route sack or tub under 245.9.7a or 203.5.8 and entered at the DDU.

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6.7 Saturation Enhanced Carrier Route Standards — Flats

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6.7.3 Saturation — (including EDDM) Carrier Route Bundles on a 5-digit/Direct Container (Saturation-CR Bundles/Container Discount Eligibility) — Flats

[Revise the text of 6.7.3 to read as follows:]

The Saturation-CR Bundles/Container discount applies to at least 90 percent or more of the total number of active residential addresses or 75 percent or more of the total number of active possible delivery addresses on each carrier route that are palletized under 705.8.0, 705.10.0, 705.12.0, or 705.13.0 on a 5-digit merged, 5-digit (scheme) merged, 5-digit carrier route, 5-digit carrier routes, or 5-digit scheme carrier route pallet entered at an Origin (None), DNDC, DSCF, or DDU entry, or in a carrier route sack or tub under 245.9.7a or 203.5.8 and entered at the DDU.

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245 Mail Preparation

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3.0 Letter Trays, Flat Trays, and Sacks

[Revise the second sentence of 3.0 to read as follows:]

***Flat mailings must be prepared in flat trays except when permitted to be prepared in sacks or letter trays under other applicable standards in this section.***

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8.0 Preparing Nonautomation Flats

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[Revise the title and text of 8.2 to read as follows:]

8.2 Bundle Preparation

Bundling in flat trays is optional unless a bundle is more finely presorted than the tray’s presort destination. Prepare a bundle when the quantity of addressed pieces for a required presort level reaches the required minimum bundle size specified in 8.3. Smaller volumes are not permitted except under 203.4.0 and for mixed ADC bundles.

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[Delete current item 8.4 in its entirety and renumber current items 8.5 through 8.10 as 8.4 through 8.9, respectively:]

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8.4 Required Traying

[Revise the introductory text of renumbered 8.4 to read as follows:]

Except as provided in 8.6, a flat tray, or a letter tray under 3.0, must be prepared when the quantity of mail for a required presort destination reaches a full flat tray (up to the handholds), 125 pieces, or 15 pounds, whichever occurs first, subject to these conditions:

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[Revise the title and introductory text of renumbered 8.6 to read as follows:]

8.6 Traying, Sacking, and Labeling

Flat trays are allowed for all sortations. Sack preparation is allowed only for the following: Nonpalletized residual 5-digit flats entered at a DDU along with carrier route flats; Nonpalletized carrier route flats entered at the DSCF (origin); Nonpalletized 5-digit flats entered at the DSCF (origin); and nonpalletized 3-digit flats entered at the DSCF (origin). DSCF (origin) 5-digit and 3-digit/SCF sacks must be entered at the BMEU and emptied into a designated container. All other sortations require flat tray preparation. Preparation sequence and labeling:

[Revise the introductory text of item a. to read as follows:]

a. 5-digit/scheme (required); scheme sort required (before 5-digit sort), only for pieces meeting the automation-flats criteria in 201.6.0 (see the definition in 1.4j); full flat tray, 125-piece, or 15-pound minimum; labeling:

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[Revise the introductory text of item b. to read as follows:]

b. 3-digit (required); full flat tray, 125-piece, or 15-pound minimum; labeling:

* * * * * 

[Revise the introductory text of item d. to read as follows:]

d. ADC (required); full flat tray, 125-piece, or 15-pound minimum; labeling:

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10.0 Preparing Automation Flats

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10.4 USPS Marketing Mail Bundle and Flat Tray Preparation

10.4.1 Bundling and Labeling

[Revise the introductory text of 10.4.1 to read as follows:]

Bundling in flat trays is optional unless a bundle is more finely presorted than the tray’s presort destination. Preparation sequence, bundle size, except as allowed under 203.4.0, and labeling:

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[Revise the title and introductory text of 10.4.3 to read as follows:]

10.4.3 Traying, Sacking, and Labeling

Sack preparation is allowed only for the following: Nonpalletized residual 5-digit flats entered at a DDU along with carrier route flats; Nonpalletized carrier route flats entered at the DSCF (origin); Nonpalletized 5-digit flats entered at the DSCF (origin); and nonpalletized 3-digit flats entered at the DSCF (origin). DSCF (origin) 5-digit and 3-digit/SCF sacks must be entered at the BMEU and emptied into a designated container. All other sortations require flat tray preparation. Preparation sequence and labeling:

* * * * * 

[Revise the text of item a. to read as follows:]

a. 5-digit/scheme (required); scheme sort required before 5-digit sort (see the definition in 1.4g.); full flat tray, 125-piece, or 15-pound minimum; labeling:

1. Line 1: For 5-digit scheme flat trays, use L007, Column B. For 5-digit flat trays/sacks, use city, state, and 5-digit ZIP Code on mail. (See 203.5.11 for overseas military mail.)

2. Line 2: For 5-digit scheme flat trays, use “STD FLTS 5D SCH BC.” For 5-digit flat trays/sacks, use “STD FLTS 5D BC.”

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246 Enter and Deposit

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4.0 Destination Sectional Center Facility (DSCF) Entry

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4.2 Eligibility

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4.2.2 Flats

* * * * * 

[Revise the text of items a. and b. to read as follows:]

a. When deposited at a DSCF or USPS-designated facility, addressed for delivery within the DSCF’s service area, and placed in a flat tray, sack (when applicable), or on a pallet labeled to the DSCF or to a destination within its service area. This includes flat trays labeled to an ADC facility with the same service area as the DSCF.

b. When prepared in 5-digit bundles and placed in or on a merged 5-digit scheme or merged 5-digit flat tray, sack (when applicable), or pallet that is deposited at the destination delivery unit as defined in 5.1.

[Add new item c. to read as follows:]

c. When prepared as nonpalletized carrier route, 5-digit scheme carrier route, 5-digit carrier route, 5-digit, or 3-digit flats in sacks entered at the DSCF (origin). DSCF (origin) 5-digit and 3-digit/SCF sacks must be entered at the BMEU and emptied into a designated container.

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5.0 Destination Delivery Unit (DDU) Entry

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5.2 Eligibility

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5.2.2 Flats

[Add new last sentence to the text of 5.2.2 to read as follows.]

***Nonpalletized residual 5-digit flats remaining after a carrier route sortation may be prepared in sacks and deposited at the DDU along with a carrier route mailing.

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700 Special Standards

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705 Advanced Preparation and Special Postage Payment Systems

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8.0 Preparing Pallets

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8.5 General Preparation

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8.5.2 Required Preparation

[Revise the text of item c. to read as follows:]

c. Bundles that cannot be placed on an ADC, NDC/ASF, or SCF pallet may be placed on mixed ADC pallets if allowed by the specific standards for the class and shape of mail, or be placed in sacks or flat trays (when applicable) (see 8.9.1).

* * * * * 

[Revise the title and text of 8.5.12 to read as follows:]

8.5.12 Nonpalletized Mail

The following applies:

a. Mail that is not palletized (e.g., the mailer chooses not to prepare NDC pallets or the bundles do not meet the machinability standards in 8.5.7 through 8.5.11) must be prepared under the standards for the price claimed.

b. For Periodicals, the mailer must separately tray or sack (when applicable) bundles of each publication that are not palletized or that are excluded from palletization.

c. Trays that are not palletized must be bedloaded.

d. Trays and sacks (including trays and sacks of bundles not placed on pallets) containing bundles remaining after all pallets are prepared may be presented with the palletized mail (and reported on the same postage statement) if separated from the palletized portion of the mailing.

e. Sack preparation is allowed only for the following:

1. Direct carrier route flats;

2. 5-digit scheme carrier route flats;

3. 5-digit carrier route flats;

4. Nonpalletized residual 5-digit flats entered at a DDU along with carrier route flats;

5. Nonpalletized carrier route flats entered at the DSCF (origin);

6. Nonpalletized 5-digit flats entered at the DSCF (origin); and

7. Nonpalletized 3-digit/SCF flats entered at the DSCF (origin).

f. DSCF (origin) 5-digit and 3-digit/SCF sacks must be entered at the BMEU and emptied into a designated container.

* * * * * 

8.10 Pallet Presort and Labeling

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8.10.3 USPS Marketing Mail or Parcel Select Lightweight — Bundles, Sacks, or Trays

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[Revise the text of item d. to read as follows]

d. 5-digit, required except for trays, permitted for bundles, trays, and sacks (when applicable). The pallet must contain only automation price and/or Presorted price mail for the same 5-digit ZIP Code or same 5–digit scheme. 5-digit scheme bundles and trays are assigned to 5-digit pallets according to the “label to” 5-digit ZIP Code. Labeling:

1. Line 1: use city, state, and 5-digit ZIP Code destination. (See 8.6.4c for overseas military mail.)

2. Line 2: For flats and irregular parcels, use “STD” followed by “FLTS” or “IRREG,” as applicable; followed by “5D”; followed by “BARCODED” (or “BC”) if the pallet contains automation-price mail; followed by “NONBARCODED” (or “NBC”) if the pallet contains Presorted-price mail. For letters, use “STD LTRS 5D”; followed by “BC” if the pallet contains barcoded letters; followed by “MACH” if the pallet contains machinable letters; followed by “MAN” if the pallet contains nonmachinable letters.

* * * * * 

[Revise the title of 9.0 to read as follows:]

9.0 Combining Bundles of Automation and Nonautomation Flats in Trays and Sacks

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9.2 Periodicals

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9.2.4 Optional Sack Preparation and Labeling

[Revise the text of 9.2.4 to read as follows:]

Optional sack preparation and labeling are allowed for nonpalletized residual 5-digit flats entered at the DDU along with carrier route flats, nonpalletized 5-digit flats entered at the DSCF (origin) and nonpalletized 3-digit/SCF flats entered at the DSCF (origin). DSCF (origin) 5-digit and 3-digit/SCF sacks must be entered at the BMEU and emptied into a designated container. Machinable barcoded price and machinable nonbarcoded price bundles must be presorted together into sacks (cosacked) in the sequence listed below. Sacks must be labeled using the following information for Lines 1 and 2 and 207.21.0 for other sack-label criteria. If, due to the physical size of the mailpieces, the machinable barcoded price pieces are considered flat-size under 201.6.0 and the machinable nonbarcoded price pieces are considered irregular parcels under 201.7.6, the processing category shown on the sack label must show “FLTS.” Preparation sequence and labeling:

a. 5-digit, required at 72 pieces; optional at 24 pieces minimum, labeling:

1. Line 1: use city, state, and 5-digit ZIP Code on mail (see 204.3.2.2 for overseas military mail).

2. Line 2: use “PER” or “NEWS” as applicable; followed by “FLTS”; followed by “5D BC/NBC.”

b. 3-digit, required at 72 pieces, optional at 24 pieces minimum; labeling:

1. Line 1: use L002, Column A.

2. Line 2: use “PER” or “NEWS” as applicable and “FLTS 3D BC/NBC.”

c. SCF, required at 72 pieces, optional at 24 pieces minimum; labeling:

1. Line 1: use L002, Column C.

2. Line 2: use “PER” or “NEWS” as applicable and “FLTS SCF BC/NBC.”

d. Origin SCF (required) and entry SCF(s) (optional), no minimum, labeling:

1. Line 1: use L002, Column C.

2. Line 2: use “PER” or “NEWS” as applicable; followed by “FLTS”; followed by “SCF BC/NBC.”

* * * * * 

9.2.5 Flat Tray Preparation — Flat-Size Machinable Pieces

[Revise the introductory text of 9.2.5 to read as follows:]

See 207.20.0 for use of flat trays. Machinable pieces meeting the criteria in 201.6.0: Mailers must bundle or group all pieces as specified in 207.25.0 and 207.22.0 for each 5-digit scheme, 5-digit, 3-digit scheme, 3-digit, SCF, and ADC destination. Bundling is optional unless a bundle is more finely presorted than the tray’s presort destination. The trays are subject to a container charge and any bundles are subject to a bundle charge. Tray preparation, sequence, and labeling:

* * * * * 

9.3 USPS Marketing Mail

* * * * * 

[Revise the title and text of 9.3.4 to read as follows:]

9.3.4 Traying/Sacking Minimums Rule

When the minimum quantity of a full flat tray, 125 pieces, or 15 pounds of mail is specified for a sortation level in 9.3.5, the provisions of 245.1.4e and 245.7.4 apply.

[Revise the title and introductory text of 9.3.5 to read as follows:]

9.3.5 Flat Tray/Sack Preparation and Labeling

Presorted price and automation price bundles prepared under 9.3.2 and 9.3.3 must be presorted together into flat trays (cotrayed) or sacks (when applicable) in the sequence listed below. Flat trays/sacks must be labeled using the following information for Lines 1 and 2, and 245.4.0 for other flat-tray label criteria. Sacks are only allowed for nonpalletized residual 5-digit flats entered at the DDU along with carrier route flats, nonpalletized 5-digit flats entered at the DSCF (origin), and nonpalletized 3-digit/SCF flats entered at the DSCF (origin). DSCF (origin) 5-digit and 3–digit/SCF sacks must be entered at the BMEU and emptied into a designated container.

[Revise the text of item a. to read as follows:]

a. 5-digit/scheme, required; scheme sort required, only for pieces meeting the automation-compatibility criteria in 201.6.0; full tray/125-piece/15-pound minimum; labeling:

1. Line 1: For 5-digit scheme flat trays, use L007, Column B. For 5-digit flat trays/sacks, use city, state, and 5-digit ZIP Code destination on pieces.

2. Line 2: For 5-digit scheme flat trays, use “STD FLT 5D SCH BC/NBC”; for 5-digit flat trays/sacks, use “STD FLT 5D BC/NBC.”

[Revise the introductory text of item b. to read as follows:]

b. 3-digit, required, full tray/125-piece/15-pound minimum; labeling:

* * * * * 

[Revise the introductory text of item d. to read as follows:]

d. ADC, required, full tray/125-piece/15-pound minimum; use L004 to determine ZIP Codes served by each ADC; labeling:

* * * * * 

10.0 Merging Bundles of Flats Using the City State Product

* * * * * 

10.2 USPS Marketing Mail

* * * * * 

10.2.3 Sacking and Traying Rules

[Revise the text of 10.2.3 to read as follows:]

When the minimum quantity of 125 pieces, 15 pounds, or a full flat tray is specified for a sortation level in 10.2.4, the provisions of 245.7.4 and 245.1.4e apply.

* * * * * 

The Postal Service will incorporate these revisions into the July 9, 2023, edition of the online DMM, which is available via Postal Explorer® at pe.usps.com.