What Is the Largest Box the Post Office Will Accept?

by Mike Frees; Updated September 26, 2017
Be aware of the USPS guidelines for package size.

The U.S. Postal Service offers several options for sending packages, ranging from overnight delivery to the less expensive parcel post, which can take from two to eight days depending on the distance. There are varying package size restrictions for each option.

Domestic Parcel Post

Package size limitations are based on a combination of length plus girth. Measure the package along the longest side and then completely around the package at its widest. The total of these two measurements cannot exceed 130 inches. Additional charges will apply if the length exceeds 34 inches or the width or height exceeds 17 inches.

Other Domestic Package Options

For first class, priority or other mailing options, length plus girth (measured as described above) cannot exceed 108 inches. The Postal Service also offers a flat-rate box for priority mail service; the largest size is 12 by 12 by 5 1/2 inches.

International Packages

For the Global Express Guaranteed service, length plus girth cannot exceed 108 inches, length or height cannot exceed 46 inches and width cannot exceed 35 inches. For other international mailing options, size restrictions vary by the destination country. For specific information about these options, call the Postal Service at 1-800-275-8777.

About the Author

Mike Frees is an I.T. professional who was first published in the Apollo Computer corporate journal in the 1980s. He has since seen print in fiction magazines, local newspapers and nonprofit newsletters, and has been writing online articles for the past year. He has a bachelor's degree from San Jose State University and a master's degree from the College of Notre Dame.

Photo Credits

bibliography-icon icon for annotation tool Cite this Article