March 8 - New Flat Rate Priority Mail LARGE box

There will be a new Priority Mail Large Flat-Rate Box in addition to the two that are currently in use. It measures (12" x 12" x 5½") and holds 50 percent more than the current box. The new box can be used for both domestic and international shipments, and online mailers can take advantage of the 5 percent discount for international shipments when postage is purchased online.

A special version of the box for the military will also be supplied, and a $2 discount, for shipments to an Army Post Office or Fleet Post Office (APO/FPO) address. The military box features the logo of "America Supports You," a Department of Defense-sponsored organization of nearly 300 home front groups that send packages to troops overseas.

Priority Mail Large Flat-Rate Box Prices

Domestic Shipping


APO/FPO Addresses


Canada and Mexico


Other Countries