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Covering up a free Priority box with a poly bag (and lesser postage), 'cause you think you're slick? Hope your customer appreciates the “Postage Due.” : r/USPS
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enJOY it by Elise Blaha Cripe: small business how to : shipping.
Flat Rate | USPS.com
Flat Rate vs. Cubic Shipping: The Best Value For Each Package
New USPS Priority Mail Flat Rate Bubble Lined Padded Envelope are free - The Whine Seller
