Package Sizes and Dimensions - USPS International | Overview

When shipping with USPS, packages must meet weight and size limits. The following tables detail international package types offered through the USPS.

Many of these supplies can be ordered for free through USPS.

Keep in mind that some packages are also subject to minimum dimensions. For instance:

International Package Size Chart

Package Type Service Max Weight Max Dimensions*
Package First-Class Package Service 4 lbs 24" Length, L+H+W= 36"
Priority Mail 4-70 lbs
(varies by country)
Length + Girth** < 108"
(varies by country)
Priority Mail Express 22-70 lbs
(varies by country)
Length + Girth** < 79"
(varies by country)
Flat Rate Small Box Priority Mail 4 lbs  8 5/8" x 5 3/8" x 1 5/8" 
Flat Rate Medium Box Priority Mail 20 lbs  13 5/8" x 11 7/8" x 3 3/8" 
Flat Rate Large Box Priority Mail 20 lbs  12" x 12" x 5 1/2"
**Girth is a special dimensional measurement, equal to (2 x width) + (2 x height). Learn more about shipment dimensions.

International Envelope Size Chart

Envelope Type Service Max Weight Max Dimensions
Letter First-Class Mail 3.5 oz 11 1/2" L x 1/4"W x 6 1/8" H
Flat Rate Envelope Priority Mail
Priority Mail Express
4 lbs  12 1/2" x 9 1/2"
Flat Rate Padded Envelope Priority Mail
Priority Mail Express
4 lbs 12 1/2" x 9 1/2"
Flat Rate Legal Envelope Priority Mail
Priority Mail Express
4 lbs 15" x 9 1/2"
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