Small Flat Rate Box; 8-5/8″ x 5-3/8″ x 1-5/8″ Inside 8-11/16″ x 5-7/16″ x 1-3/4″ Outside $11.00 $11.35 Medium Flat Rate Box; 11″ x 8-1/2″ x 5-1/2″ Inside11-1/4″ x 8-3/4″ x 6 ...
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 ...
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