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 ...
All three carriers offer flat-rate shipping options. USPS cannot ship packages weighing ... When using UPS Simple Rate, prices for medium boxes start at $16.90, while large boxes of up to 1,050 ...
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