If you are looking for a quick, fast and inexpensive way to send an item, try a United States Postal Service (USPS) flat rate box. You can find USPS flat rate boxes in the Priority Mail section at your post office. Pick up a box, stuff it with items and pay a flat rate depending on the box size -- not the box weight or the distance traveled. Your box will be delivered within two days, in most cases, within the continental United States. There are three sizes of USPS flat boxes in various dimensions to meet your shipping needs.
Small Flat Rate Box
The size of the small flat rate box is 8 5/8" x 5 3/8" x 1 5/8." As of December 2010, the cost to ship this box is $4.95.
Medium Flat Rate Boxes
There are two medium flat rate box sizes. The first is 11" x 8 1/2" x 5 1/2." The second is 13 5/8" x 11 7/8" x 3 3/8." Both boxes cost $10.70 to ship, as of December 2010.
Large Flat Rate Box
The large flat rate box size is 12" x 12" x 5 1/2." As of December 2010, domestic delivery cost of a large flat rate box is $14.50.