

More than 2 cubic feet (3,456 cubic inches): add $25.00.Between 22 and 30 inches long: add $4.00.Nonstandard Fee: You’ll pay an extra fee for sending a nonstandard size if your package measures:.


Use your own box and pay by weight and zone (distance): When sealing a Flat Rate Envelope or Box, the container flaps must be able to close within the normal folds.Use our Priority Mail Flat Rate Envelopes or Boxes that come in standard sizes so you don't have to worry about measuring them.Pay the same price for mailpieces weighing up to 70 lbs going anywhere in the U.S.Weight, Size, & Shape Requirements Use USPS Priority Mail Flat Rate packaging and pay one price:
