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Weight restrictions for Priority Mail International Large and Medium Flat Rate Boxes are 20 pounds, and 4 pounds for Priority Mail International Flat Rate Envelopes and Small Flat Rate Priced Boxes. Weight restrictions for Priority Mail Express International Flat Rate Envelopes are 4 pounds. Weight restrictions for domestic Priority Mail Express Flat Rate Envelopes, and Priority Mail Flat Rate Envelopes and Boxes are 70 pounds. 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. Regular Flat-Rate Envelopes, Legal Flat-Rate. The Medium Flat-Rate Box would increase to 16.10, the Large Flat-Rate Box would decrease to 21.50 and the price of the APO/FPO Large Flat-Rate Box would decrease to 20.00.

When sealing a Flat Rate Box or Flat Rate Envelope, the container flaps must be able to close within the normal folds. If favorably reviewed by the PRC, the new prices will include an increase in the price of a Small Flat-Rate Box to 9.45. Note: Flat Rate prices are available when material is sent in a USPS -produced Flat Rate Envelope or Box. USPS Marketing Mail Eligibility Decision TreeĪvailable for Domestic and International PRIORITY MAIL EXPRESS Flat Rate Envelopeġ2-1/2' x 9-1/2' Legal Flat Rate Envelopeġ2-1/2' x 9-1/2' Gift Card Flat Rate EnvelopeĨ-11/16' x 5-7/16' x 1-3/4' – Outside Medium Flat Rate Boxesġ4' x 12' x 3-1/2' – Outside Large Flat Rate Boxġ2-1/4' x 12-1/4' x 6' – Outside Large Video Box (Flat Rate pricing for international only)ĩ-9/16' x 6-7/16' x 2-3/16' – Outside DVD Box (Flat Rate pricing for international only).Designing Letter and Reply Mail (PUB 25).

Usps small flat box rate