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Where can I get the free trial pack of USPS Flat Rate Shipping Boxes?

There is a TV Ad out there that has a website you can visit to get a free trial pack of their flat rate shipping boxes. Trying to find out what that is. Thanks!

Public Comments

1. USPS Priority Mail Flat Rate boxes are always free from the USPS. You pay only the postage when you mail the box. You can order them in packs of 10 or 25 of each size: http://www.usps.com/shipping/prioritymail.htm