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Priority Mail Flat Rate Envelope


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The Priority Mail® Flat Rate Envelope is quick, easy, and convenient, simplifying your Priority Mail® shipping process for documents.

This paperboard envelope features a predetermined flat rate regardless of the weight or destination zone of the package. This envelope is ideal for sending 8″ x 11″ size documents, including passports and passport documentation.

Additional information


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  1. Exceptions apply. For details, visit the Domestic Mail Manual.
  2. The expected delivery date does not come with a money-back guarantee.
  3. Scheduled delivery date depends on origin, destination, and drop-off time. Some restrictions apply. For additional information, visit USPS.
  4. Excludes Prepaid Forever Priority Mail Flat Rate products.


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