USPS Large Envelopes - Flats | Overview
ShippingEasy wants to help you learn about the e-commerce industry. This article describes a service provided by the United States Postal Service (USPS).
The USPS is a separate organization from ShippingEasy. For more information about USPS services, visit your local Post Office or go to USPS.com.
The words "large envelopes" and "flats" are used interchangeably at USPS when discussing mail that is slightly larger than regular, letter-sized mail. All large envelopes/flats must be rectangular or square-shaped and somewhat flexible. You can find out how USPS determines flexibility by referring to the USPS guide.
View ShippingEasy's Postage Rates for USPS Shipments.
For your mail to be considered a large envelope/flat and not a letter, it must exceed one or more of the letter-size minimum dimensions listed in the table below:
|
Dimension |
Minimum |
|---|---|
|
Height |
6-1/8" |
|
Length |
11-1/2" |
|
Thickness |
1/4" |
For your mail to be considered a large envelope/flat and not a package (parcel), it must not exceed the following criteria:
Learn more about shipment dimensions.
Flats Treated as Packages
Large envelopes/flats that meet the following criteria will be treated as packages and will use the Ground Advantage rate if you select the First Class Mail service:
-
More than 15" long, 12" high, or 3/4" thick
-
Are rigid (can't bend)
-
Not uniformly thick (lumpy)
The maximum weight for large envelopes is 13 ounces. Large envelopes and flats can be shipped via Ground Advantage or Priority Mail. However, a large envelope/flat exceeding 13 ounces is classified as a Priority Mail item.
Learn more about shipment weight.
More questions about USPS letters and flats? Check out the USPS Domestic Mail Manual.
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