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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.
A First Class letter can only weigh up to 3.5 ounces per mail piece. If you need to send papers or documentation that weighs more than 3.5 ounces, a good strategy is to break up your mail into separate, multiple envelopes with their own stamps. Or, you could always ship it all together using a single Priority Mail Flat Rate Envelope!
What is the weight of your mail piece? Pounds. Ounces. Kilograms. Please select from the following options. View Dimensions. Letter. Large Envelope. Package.
Find answers to common questions about postage stamps, including how to buy, use, and collect them.
For just 1 $0.73 First-Class Mail ® Forever ® stamp, you can send 1 oz (about 4 sheets of regular, 8-1/2" x 11" paper in a rectangular envelope) to anywhere in the U.S.! Show More. Envelopes must be rectangular and made of paper to qualify for letter prices. Your envelope can be a maximum of 11-1/2" long x 6-1/8" high.
Approximately 5-6 sheets of standard paper can be sent with one stamp; Weigh the mail piece and divide by 0.16oz per sheet to find sheets per stamp; Refer to USPS postage charts for large envelopes and packages; Add enough stamps to match the total required postage
The flat-rate box has a 20-pound weight limit for allowable contents, and the flat-rate envelope has a 4-pound weight limit. Note: Use former domestic packaging until supplies are depleted. Although the packaging says “For Domestic Use Only,” it can be used for both domestic and international shipments.