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What are the requirements for first class mail?

Weight, Size, Shape Requirements Maximum weight for First-Class Mail letters is 3.5 oz; for large First-Class Mail envelopes, the maximum weight is 13 oz. All postcards and envelopes (or flats) must be rectangular, otherwise an additional charge may apply.

What are the requirements for mailing envelopes?

To be eligible for mailing at the price for letters, a piece must be: Rectangular. At least 3-1/2 inches high x 5 inches long x 0.007 inch thick. No more than 6-1/8 inches high x 11-1/2 inches long x 1/4 inch thick.

How do you send a flat in the mail?

If you want to send letter-sized papers without folding them, you can use a large envelope (called a flat); the postage for flats starts at $1.39. If your large envelope is nonrectangular, rigid (cant bend), or lumpy (not uniformly thick), youll have to pay the package price.

What are the rules for flat rate envelopes?

Measure the items you plan to ship to determine whether they can fit into a USPS flat rate envelope or box. The package must close completely without any protrusions or bulges. Verify that the weight does not exceed 70 lbs.

What qualifies as USPS first class?

First-class package service is for shipping packages and poly mailers up to 1 pound. First-class mail is for mailing letters, large envelopes, and postcards.

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