Flats (USPS)

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

## Size restrictions

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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

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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.

## External links and references

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* Domestic Mail Manual 101.2 Flats Physical Standards

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United States Postal Service

Organizations|

* American Letter Mail Company
* American Postal Workers Union
* Board of Governors of the United States Postal Service
* Bureau of Transportation
* Citizens' Stamp Advisory Committee
* National Alliance of Postal and Federal Employees
* National Association of Letter Carriers
* National Association of Presort Mailers
* National Postal Mail Handlers Union
* National Rural Letter Carriers' Association
* Postal Regulatory Commission
* Postal Transportation Service
* PostalWatch Incorporated
* United States Postal Inspection Service
* United States Postal Service Office of Inspector General

Systems|

* Address Management System
* Advanced Facer-Canceler System
* Coding Accuracy Support System
* Delivery Bar Code Sorter
* Flats Sequencing System
* Locatable Address Conversion System
* United States Postal Savings System

Services|

* Click-N-Ship
* Express mail in the United States
* National Change Of Address
* Permit mail
* Permit Reply Mail
* Postal notes
* Railway Mail Service
* Registered mail
* Special Delivery
* Special handling

Facilities|

* Air mail facility
* Boat railway post office
* Community post office
* Dead letter office
* Highway post office
* J. W. Westcott II
* List of United States post offices
* National Postal Museum
* Network distribution center
* Railway mail service library
* Red Brick Roads
* Sectional center facility
* Streetcar railway post office
* Terminal railway post office

Legal|

* Comstock laws
* Post Office Act
* Postal Accountability and Enhancement Act
* Postal Reorganization Act
* Postal Service Act
* Postal Service Reform Act of 2022
* Private Express Statutes
* Rural Post Roads Act of 1916
* Title 39 of the United States Code

Related|

* 2020 United States Postal Service crisis
* United States airmail service
* CAR-RT SORT
* Catcher pouch
* Cimarron Redoubt
* Domestic Mail Manual
* Facing Identification Mark
* Flats
* Grumman LLV
* Information-Based Indicia
* The Inspectors
* Intelligent Mail barcode
* Label 228
* List of postal killings
* List of U.S. state abbreviations
* List of United States airmail stamps
* Mail bag
* Mail cover
* Mail hook
* Mail Isolation Control and Tracking
* Mail jumping
* Mail pouch
* Mail sack
* Mail satchel
* The Mail Story
* Nixie
* ORM-D
* Owney (dog)
* Pony Express mochila
* Postage stamps and postal history of the United States
* Postal Alpha Numeric Encoding Technique
* Postal Clause
* Postal voting in the United States
* Postal worker
* Postmaster General
* Prohibitory Order
* Remote Bar Coding System
* Rural Free Delivery
* Rural letter carrier
* STD-4C
* United States post office murals
* List of murals
* USPS Post Office Box Lobby Recycling program
* United States Postal Service creed

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