ShippingEasy wants to help you learn about the e-commerce industry. This article describes service requirements set 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.
Understanding the specific package sizes and dimensions for USPS services will help you make more informed decisions about how to ship your products. This guide outlines the requirements of girth, packaging, and dimensions for domestic services. By looking at each section separately, you can more accurately measure your shipment and determine what the cost will be.
Dimensions and Girth
Shipping dimensions are only used if you are sending a shipment in a custom box or envelope rather than in a carrier's flat-rate packaging. The shipment dimensions will affect the cost of the shipment, so accurate measurements are important.
Dimensional (cubic) pricing and dimensional (DIM) weight pricing are based on volume (length x width x height) rather than physical weight as the volume determines how much space the package takes up in the truck or airplane.
"Machinable" packages mean they are able to be sorted by a machine. If your package is larger than the machine is able to sort, it will be bumped into the next class of letters or packages, which often costs more money.
Machinable - Oversized vs Minimum dimensions
Oversized Priority Mail packages may be subject to dimensional pricing even when below the maximum 108" dimension. Learn more about USPS oversized package charges.
Packages are also subject to minimum dimensions. No package may be smaller than 5" x 3.5" x 0.007". Machinable packages may not be smaller than 6" x 3" x 0.25". Non-machinable packages may be subject to additional handling fees. Learn more about physical standards for parcels.
When determining your package size, you may need to know the package's girth.
The girth of a package is equal to (2 x width) + (2 x height).
Some domestic shipping supplies are offered for free through the USPS.
- Priority Mail
- Priority Mail Express
- Flat Rate
- International Shipping
ShippingEasy Tools for Managing Packages
ShippingEasy offers tools to make selecting the right carrier and package even easier.
If you have your own unique packaging that you use to ship your products, you can save your package size and dimension on ShippingEasy's PACKAGE SETUP page. These are for packages that are different from the normal USPS Carrier Packages. Learn more about custom packages.
Shipping Presets are saved carrier package and service types available for quick use on the ORDERS and READY TO SHIP page. ShippingEasy has 13 pre-loaded shipping presets available for use with USPS. You can also set your own. Learn more about shipping presets.
Carrier packages are available when using a compatible USPS service on the READY TO SHIP page. Learn more about selecting a carrier and package in ShippingEasy.
USPS Domestic - Standard Package Sizes and Dimensions
The following tables lay out the maximum weights and dimensions for domestic package and envelope types offered through the USPS. Learn more about shipment dimensions.
Domestic Package Size Chart
|Package Type||Service||Max Weight||Max Dimensions|
|Package||First-Class Package Service||15.9 oz||22" x 18" x 15"|
|Parcel Select Ground||70 lbs||Length + Girth < 130"|
|Priority Mail||70 lbs||Length + Girth < 108"|
|Priority Mail Express||70 lbs||Length + Girth < 108"|
|Flat Rate Small Box||Priority Mail||70 lbs||8-5/8" x 5-3/8" x 1-5/8"|
|Flat Rate Medium Box||Priority Mail||70 lbs||13-5/8" x 11-7/8" x 3-3/8"|
|Flat Rate Large Box||Priority Mail||70 lbs||12" x 12" x 5-1/2"|
|Regional Rate Box A||Priority Mail||15 lbs||10-15/16" x 2-3/8" x 12-13/16"
10" x 7" x 4-3/4"
|Regional Rate Box B||Priority Mail||20 lbs||14-3/8" x 2-7/8" x 15-7/8"
12" x 10-1/4" x 5"
Domestic Envelope Size Chart
|Envelope Type||Service||Max Weight||Max Dimensions|
|Letter||First Class Mail||3.5 oz||11-1/2" x 1/4" x 6-1/8"|
|Flat Rate Envelope||Priority Mail
Priority Mail Express
|70 lbs||12-1/2" x 9-1/2"|
|Flat Rate Padded Envelope||Priority Mail
Priority Mail Express
|70 lbs||13" x 10"|
|Flat Rate Legal Envelope||Priority Mail
Priority Mail Express
|70 lbs||15" x 9-1/2"|