The U.S. Postal Service sells envelopes in sizes ranging from 5-by-10 inches all the way up to 11 5/8-by-15 1/8 inches. Most of their envelopes are dedicated to Priority Mail for items needing urgent delivery. The Postal... More »

As of 2015, the U.S. Postal Service offers two sizes of flat-rate boxes for Express one-to-two-day delivery. It also offers five sizes of flat-rate boxes for Priority one-to-three-day delivery. More »

A USPS Flat Rate Box offers one low flat rate, so pricing is determined by the size box you choose rather than the weight of the box or the destination of the package. More »

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The U.S. Postal Service determines insurance rates according to the sender's declared value of the item, reports USPS. The maximum insurance liability for postage items is $5,000 as of 2015. Some postal services include ... More »

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The U.S. Postal Service divides mail into standard and non-standard sizes. An envelope is classified as non-standard if it exceeds 6 1/8 inches in height, 11 1/2 inches in length, 1/4 inch in thickness or if its length d... More »

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The largest sized shipping box USPS allows is 130 inches in combined length and girth. The maximum weight allowed for shipping boxes and parcels is 70 pounds. More »

The U.S. Postal Service stipulates that small mailboxes should be approximately 5 inches wide, 18.5 inches long and 6 inches tall, and medium mailboxes should be 6 inches wide, 19 inches long and 7 inches tall. Large mai... More »

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