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Is using large flat rate box not allowed? See comment for details... : r/poshmark
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USPS Flat Rate Boxes, Envelopes, & Pricing - EasyPost
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Probably a dumb question, but I want to be sure since the documents I'm sending out is super important. What difference besides the size do these two envelopes have? They're both the
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USPS Flat Rate Boxes, Envelopes, & Pricing - EasyPost
USPS Flat Rate Boxes, Envelopes, & Pricing - EasyPost
