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How big a package will USPS take?

What's the largest package size the the US Postal Service will ship?


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For every size and shape of mail or package, there is a minimum and maximum size. See the charts below to ensure your mail meets the United States Postal Service measurement standards and limits.

Standard Shape and Size Guidelines

Letters:
• Maximum thickness is 1/4”
• Minimum size is 5” long X 3 1/2” high
• Maximum size is 11 1/2" long X 6 1/8" high
Postcard:
• Maximum size is 6” long X 4 1/4” high
• Minimum size is 5” long X 3 1/2” high
Large Envelopes:
• Maximum thickness is 3/4”
• Minimum size is 11 1/2" long X 6 1/8" high
• Maximum size is 15" long X 12" high
Parcel Post package:
• Maximum size is length + width around largest point = 130”
Other package services:
• Maximum size is length + width around largest point = 108”

Unusual Shapes and Sizes Guidelines
Once a piece of mail exceeds the maximum length, height or thickness of one shape, it automatically gets classified as the next largest shape. In addition, a piece of mail requires more postage when it is a certain shape or size that is difficult to process on mail sorting machines.

Some mail requires additional postage because it is difficult to process on mail sorting machines. The examples below could require additional postage:
• Square envelopes.
• Packages larger than 34 inches long, 17 inches wide or 17 inches high.
• Envelopes on which the address is written parallel to the shorter edge.
• Packages weighing more than 35 pounds.
• Books or printed material weighing more than 25 pounds.
• Tubes and rolls.
Mar 31st, 2011 at 4:34 PM
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Will usps ship a package 22 1/2 in. long, 19 1/2 in wide , 14 in. high
Dec 19th, 2011 at 2:10 AM
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MY USPS OFFICE DOESNT ACCEPT PACKAGES THAT ARE TOO BIG TO FIT INTO THE WINDOW.
Jun 2nd, 2015 at 3:05 PM
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