The boxes are provided by USPS for free, and if your shipment is going to Zones 1-4, you'll find that this option is usually less expensive than Flat Rate Boxes. Priority Mail Medium Flat Rate Box ...
Retail consumers – that is, people using USPS to ship their own items – may most directly notice the increase of $0.95 to every USPS Priority Mail flat-rate item ... in the box and click ...
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