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 International Flat Rate:
- Maximum Weight for Flat Rate Envelope and Small Flat Rate Box: 4 lbs (64 ounces)
- Maximum Weight for Medium and Large Flat Rate Box: 20 lbs (320 ounces)
Priority Mail Express International:
- Maximum Size: 79” combined Length + Girth
- Maximum Weight: 70 lbs (1120 ounces)
Size Shipping Tips:
- When shipping internationally, there may be differences in the maximum weight and dimensions based on what that country and USPS have agreed upon. You can check out those differences, as well as a full list of prohibited items per country here: https://pe.usps.com/text/Imm/ab_toc.htm
- Look out for Dimensional Weight on your light, oversized packages: https://www.shippingschool.com/dimensional-weight/