DMM TOC > 100 Retail Letters, Cards, Flats, and Parcels > 120 Priority Mail125 Mail Preparation1.0 Preparation for Priority Mail1.1 Priority Mail Packaging Provided by the USPSPriority Mail packaging provided by the USPS must be used only for Priority Mail. Regardless of how the packaging is reconfigured or how markings may be obliterated, any matter mailed in USPS‑provided Priority Mail packaging is charged the appropriate Priority Mail rate. [C010.6.2] 1.2 Required UseThe sender's domestic return address must appear legibly on Priority Mail. [A010.4.4] 2.0 Marking for Priority Mail2.1 MarkingThe marking "Priority" or "Priority Mail" must be placed prominently on the address side of each piece of single‑piece rate Priority Mail. [M120.1.1] 3.0 Preparation for a Permit Imprint Mailing3.1 Preparing a Permit Imprint MailingTo use a permit imprint, the pieces must be of identical weight and, unless all the pieces are in a weight category for which the rate does not vary by zone, the pieces must be separated by zone when presented to the post office. [P100.3.1] 3.2 Payment MethodA permit imprint may be used for mailings of nonidentical‑weight pieces only if authorized by Business Mailer Support at USPS Headquarters. [P100.1.1] |