Usps Padded Flat Rate Envelope Size. USPS flat rate boxes and envelopes are all a form of Priority Mail. Except for Priority Mail Flat Rate packaging, Priority Mail prices are based on weight and zone.
In the United States, USPS flat-rate packaging is a very common choice.
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For your convenience all orders will contain a carrier release endorsement "Leave if No Response". Flat Rate Envelopes and Small Flat Rate Boxes are good deals, but otherwise you should use your own packaging. Here's everything you need to know about the USPS Flat Rate box The smaller boxes and envelopes are typically cheaper than the larger ones, with some exceptions, so you're better off with a box that fits your items.
