Flats
Flat Mail weighs between three and 15.99 ounces.* It can be wrapped, unwrapped, sleeved, or enveloped, and must exceed at least one of the following minimums:
Non-Automated
| Minimum | Maximum | |
| Height | 6 1/8" | 12" |
| Length | 11 1/2" | 15" |
| Thickness | 1/4" | 3/4" |
Automated
| Minimum | Maximum | |
| Height | 5" | 10" |
| Length | 5" | 14 1/4" |
| Thickness | .02" | 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.