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Strapping requirements for First-Class Flats in letter trays using MailStream Plus

Product Affected:  MailStream Plus™
Product Feature: USPS / Postal
All Domestic Mail Manual (DMM) references are as-of Sept 2018

In the DMM palletization section 705.8, it says-
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DMM 705 8.14 Pallets of Bundles, Sacks, and Trays
8.14.5 Securing Trays
Trays must be sleeved and strapped under 235.3.0 for First-Class Mail letters, 245.3.0 for USPS Marketing Mail letters, 235.3.0 for First-Class Mail flats, 245.3.0 for USPS Marketing Mail flats, 265.3.0 for Bound Printed Matter flats, or 275.3.0 for Media Mail flats and Library Mail flats, except that strapping is not required for any letter tray placed on a 5-digit, 3-digit, or SCF pallet secured with stretchwrap. In addition, if the processing and distribution manager gives a written waiver, strapping is not required for any letter tray that originates and destinates in the same SCF (mail processing plant) service area. 
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DMM 235 Mail Preparation
3.0 Letter Trays says-
See 203.5.0 for tray preparation standards. 
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203 5.0 Letter and Flat Trays
5.4 Letter Tray Sleeving and Strapping 
Letter trays are secured using USPS-provided sleeves. Each sleeved letter tray must then be secured with one plastic strap placed tightly around the length of the tray without crushing the tray or sleeve. 

5.5 Letter Tray Strapping Exception 
Strapping is not required for any letter tray placed on a 5-digit, 3-digit, or SCF pallet secured with stretchwrap. If the processing and distribution manager gives a written waiver, strapping is not required for any mixed AADC or ADC letter tray of First-Class Mail or for any letter tray that originates and destinates in the same SCF, ADC, or AADC (mail processing plant) service areas. 
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Please refer to the DMM or your USPS Acceptance Clerk for additional information or clarification.
UPDATED:  September 21, 2018