Priority mail flat rate11/7/2023 ![]() You can easily obtain small quantities from your local post office. One of the most attractive features of USPS flat rate shipping is that USPS flat rate boxes and envelopes are provided free of charge. How much do USPS flat rate boxes and envelopes cost? If in doubt, refer to the complete list of restricted items here. It’s important to know that USPS does not allow some items, such as cigarettes, perfumes, ammunition or hazardous materials to be shipped by mail.
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