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Priority Mail Flat Rate® Medium Box | USPS.com
Priority Mail | USPS
USPS Flat Rate Box Sizes, Prices, and How it Works - Shippo
Postage Rates & Prices | USPS
Parcel Size, Weight & Fee Standards - USPS
USPS.com FAQs
Flat-Rate Package Options - About.usps.com
Boxes | Priority Mail | USPS.com
The Dimensions of all the Free USPS Boxes - Shipping School
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