Flat Rate Box Price 2025. Not sure which mailing service you need? Priority mail flat rate® small box.
The cost to ship using usps flat rate boxes and envelopes is very competitive. You can send any box of any size and get a flat rate.
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Flat Rate Box Price 2025. Not sure which mailing service you need? Priority mail flat rate® small box.
The cost to ship using usps flat rate boxes and envelopes is very competitive. You can send any box of any size and get a flat rate.