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Flat-Size Mail

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Flat-Size Mail - definition(s)

Flat-Size Mail - A mailpiece that exceeds one of the dimensions for letter-size mail (11-1/2 inches long, 6-1/8 inches high, 1/4 inch thick) but that does not exceed the maximum dimension for the mail processing category (15 inches long, 12 inches high, 3/4 inch thick). Dimensions are different for automation rate flat-size mail eligibility. Flat-size mail may be unwrapped, sleeved, wrapped, or enveloped.

[Category=Postal ]

Source: USPS, 19 September 2009 16:27:11, External

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