Except for USPS Retail Ground and Parcel Select, no mailpiece may measure more than 108 inches in length and girth combined.
Length is the measurement of the longest dimension and girth is the distance around the thickest part (perpendicular to the length).
Maximum weight is 70 pounds.
What size box can you ship USPS?
USPS Priority Mail Flat Rate Options
| Type | Size | Price |
|---|---|---|
| Padded Envelopes | 12 1/2″ x 9 1/2″ | $7.55 |
| Legal Envelopes | 15″ x 9 1/2″ | $7.25 |
| Small Box | 8 11/16″ x 5 7/16″ x 1 3/4″ | $7.50 |
| Medium Boxes | 11 1/4″ x 8 3/4″ x 6″ or 14″ x 12″ x 3 1/2″ | $12.80 |
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What is considered an oversized package by USPS?
Dimensional Weight, Balloon, and Oversize Package Surcharges. The oversized rate is applied to Parcel Select shipments whose length + girth are greater than 108″. The largest domestic package size that can be shipped via the USPS is 130″ (length + distance around the largest point) and must by shipped Parcel Select.
Can you ship large boxes through USPS?
If you need a large flat rate Priority Mail box, make sure it’s heavier than 5 lbs. Otherwise, FedEx or UPS Ground will always be cheaper. If your item is heavier than 2 lbs, try to fit everything into a USPS flat rate medium box. Otherwise, Fedex and UPS will be cheaper for heavier packages.
How large can a USPS First Class package be?
First Class Mail is the most popular and economical way to send items through USPS. You can send standard postcards, letters and large envelopes and small packages up to 15.99 ounces using First Class Mail. If your First Class package is over 15.99 ounces, you must upgrade the mail class to Priority Mail.
Photo in the article by “Mount Pleasant Granary” http://mountpleasantgranary.net/blog/index.php?m=12&y=13&entry=entry131227-235501