Flats (USPS)

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:

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 plenty of room to put lots of material in the envelope. An issue, however, is that the higher the weight the higher the postage, especially for First-Class Mail.

External links and references


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