Maximum Sizes and Weights for USPS services

Domestic Services:

First Class Package

  • Maximum Size: 22″ x 18″ x 15″
  • Maximum Weight: 15.99 oz 

Weight-Based Priority Mail

  • Maximum Size: 108” combined Length + Girth
  • Maximum Weight: 70 lbs (1120 ounces)

Priority Mail Cubic

  • Maximum Size: 18" in any dimension, total volume cannot exceed 0.5 cubic feet
  • Cubic Softpack Maximum Size: 36” combined Length + Width
  • Maximum Weight: 20 lbs (320 ounces)

Priority Mail Flat Rate

  • Maximum Weight: 70 lbs (1120 ounces)

Priority Mail Express

  • Maximum Size: 108” combined Length + Girth
  • Maximum Weight: 70 lbs (1120 ounces)

Parcel Select Ground

  • Maximum Size: 130” combined Length + Girth
  • Maximum Weight: 70 lbs (1120 ounces)

Priority Mail Regional Rate Box A

  • Maximum Weight: 15 lbs (240 ounces)

Priority Mail Regional Rate Box B

  • Maximum Weight: 20 lbs (320 ounces)

International Services:

First Class Package International: 

  • Maximum Size: 24″ in any dimension, 36″ combined Length + Width + Height
  • Maximum Weight: 4 lbs (64 ounces)

Simple Export Rate:

  • Maximum Size: 24″ in any dimension, 36″ combined Length + Width + Height
  • Maximum Weight: 4 lbs (64 ounces)

Priority Mail International:

  • Maximum Size: 108” combined Length + Girth
  • Maximum Weight: 70 lbs (1120 ounces)

Priority Mail Express International:

  • Maximum Size: 79” combined Length + Girth
  • Maximum Weight: 70 lbs (1120 ounces)

Size Shipping Tips:

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