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I sell jewelry and have always mailed with USPS first class. I got this mail returned to me today and have no idea what went wrong. I never had an issue before.
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Amazon.com : CARDBRICK MAILERS for 12x18”, 11x17” Photos, Posters, and Documents. Pack of 10. Cardboard Rigid Mailers. Heavy Duty No Bend Protection Shipping Envelopes. Lightweight Shippers for Reduced Postage. : Office Products
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DMM 101 Physical Standards for Retail Letters, Flats, and Parcels
