A three-dimensional parcel with a combined length and girth up to 108" [130" for Parcel Select Ground].
Size and weight restrictions may vary based on shipping method and destination country.
All rectangular envelopes thicker than 3/4", or any rigid or non-rectangular envelope regardless of thickness.
All non-rectangular parcels with a combined length and girth no greater than 108", and rolls and tubes up to 26" long.
Size and weight restrictions may vary based on the shipping method and destination country.
Official USPS boxes and envelopes are available in various sizes for a fixed postage rate, regardless of shipping weight.
Flat Rate packaging can be obtained for free at your local Post Office or online at usps.com.
*Available for Priority Mail, Priority Mail Express, Priority Mail International, and Priority Mail Express International only.
Official USPS boxes best used for small, dense packages traveling short distances. Prices are based on box size and destination postal zone.
Regional Rate packaging can be obtained online for free at usps.com.