Priority Mail® Priority Mail® is used for documents, gifts, and merchandise. Any mailable item may be sent as Priority Mail. The maximum weight is 70 pounds. The maximum size is 108 inches or less in combined length and distance around the thickest part. Mark each package "Priority Mail" in the postage area or use a USPS-provided Priority Mail envelope or box. For weights over 5 pounds, see the Domestic Rate Calculator. For complete Priority Mail rates see Ratefold (Notice 123) (PDF) or Domestic Mail Manual Rates and Fees (HTML). The Zone Chart Program provides a 1-page zone chart for your origin ZIP Code.