Priority Mail Large Flat-Rate Box

When sealing a flat-rate box or flat-rate envelope, the container flaps must be able to close within the normal folds. 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.

Sizes: 12 inches long, 12 inches long and 6 inches thick

Domestic:

One low price regardless of weight for items mailed to U.S. destinations in the Priority Mail Large Flat-Rate boxes provided by the Postal Service.

International:

Online discount available through Click-N-Ship to international destinations. Weight limit is 20 pounds to international destinations for items mailed in the Priority Mail Large Flat-Rate boxes provided by the Postal Service.

APO/FPO Priority Mail Large Flat-Rate Box

The APO/FPO box can be identified by the two markings, "APO/FPO Flat-Rate Box" and "Americasupportsyou.mil." Price discounts are available for this box to APO/FPO destination addresses when sent to domestic addresses. This box can also be used for international destinations.