DMM TOC > 100 Retail Letters, Cards, Flats, and Parcels > 120 Priority Mail|
125 Mail Preparation
1.1 Priority Mail Packaging Provided by the USPS
Priority 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-produced Priority Mail packaging is charged the appropriate Priority Mail price.
[6-2-14] When sealing a Flat Rate Envelope, Flat Rate Box, or Regional Rate Box, the container flaps must be able to close within the normal folds. Tape may be applied to the flaps and seams to reinforce the container, provided the design of the container is not enlarged by opening the sides and the container is not reconstructed in any way.
1.3 Required Use