This can be a drawback for some because, unless you are a high volume shipper, you cannot get customized boxes with specific branding. In order to have access to the USPS Priority Mail Flat Rate pricing, you must use one of USPS designated Flat Rate Boxes you cannot use just any box of the same dimensions. You can pick them up at any post office or USPS will actually ship the boxes opens in new tab open_in_new to you for free. One of the many benefits of shipping with USPS Flat Rate Boxes is that the boxes themselves are free.

You may order free packaging supplies at /store.How You Can Use USPS Flat Rate Boxes and Envelopes to Save on Shipping 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. When sealing a Flat Rate Box or Flat Rate Envelope, the container flaps must be able to close within the normal folds.

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).

Large flat rate box weight limit