What kind of bags can you ship with USPS?

Flats or large envelopes These can be made of paper, plastic bags/polyethylene, flat corrugated boxes, or cloth. Polyethylene mailers, like our Poly Mailers, must be at least 2 mils thick for shipments up to 5 pounds and 4 mils thick for shipments up to 10 pounds (and are not acceptable for shipments over 10 pounds).



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Parcels over ¾-inch thick (or exceed other dimensions required to qualify as a large envelope/flat) but still relatively thin could be packaged in expandable paper envelopes, poly mailers/plastic bags, paper bags or wrap, or even cloth.

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If the package is not classified as Priority Mail Express™ service (domestic or international), Priority Mail® service, First–Class Package Service™, or an international letter package, it may be opened and its contents examined.

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As we mentioned above, combining your own custom packaging with the right USPS service is often more cost-effective than using flat-rate boxes. One such option is taking advantage of cubic pricing. Priority Mail cubic pricing is a more efficient USPS service for shipping small packages that weigh up to 20 pounds.

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USPS offers a variety of shipping options, including Priority Mail, First-Class Mail, and Media Mail. For the cheapest way to ship a big box of clothes, Priority Mail is likely your best option. Priority Mail is a flat-rate shipping option that includes tracking and insurance.

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