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Priority Mail Flat Rate Box


The Priority Mail® Large Flat Rate Box is a quick, easy, and convenient way for you to ship Priority Mail® packages. It features predetermined rates regardless of weight (domestically) or destination, similar to our other Flat Rate products.

Additional information


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


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