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Flat Mail weighs between 1 and 15.99 ounces.* It can be wrapped, unwrapped, sleeved, or enveloped, and must exceed at least one of the following minimums:

  Minimum Maximum
Height 5" 12"
Length 6" 15"
Thickness .009" 3/4"
  Minimum Maximum
Height 6 1/8" 12"
Length 11 1/2" 15"
Thickness 1/4" 3/4"
Examples of Flat mail
  • Advertisements
  • Booklets
  • Brochures
  • Catalogs
  • Information Kits
  • Guidebooks
  • Membership Materials
  • Pricing Sheets
  • Questionnaires
  • Reports Schedules
  • Welcome Packets

*It is the customer's responsibility to ensure mail pieces constitute Flat Mail under the current USPS Domestic Mail Manual.

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