Flat (USPS)

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The United States Postal Service uses the words flats and nonletters interchangeably to refer to large envelopes, newsletters, and magazines.

The United States Postal Service uses the words flats and nonletters interchangeably to refer to large envelopes, newsletters, and magazines.

Size restrictions

To fit the definition a flat must: Have one dimension that is greater than 6-1/8 inches high OR 11-½ inches long (the side parallel to the address as read) OR ¼ inch thick. Be no more than 12 inches high x 15 inches long x ¾ inch thick. Weigh no more than 13 ounces. Furthermore, the item must be somewhat bendable: see the USPS Domestic Mail Manual for exact details. This general rule does not apply to: Automation rate flats and Standard Mail Enhanced Carrier Route flats.

Postage

The maximum size for a flat provides enough room to enclose much material. An issue, however, is that the higher the weight the higher the postage, especially for First-Class Mail.

Text derived from https://en.wikipedia.org/w/index.php?oldid=1327851305 under CC BY-SA 4.0; modifications have been made.

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