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Flat rate envelope dimensions12/24/2023 ![]() ![]() ![]() If your book does NOT overhang the paper, it does not meet the heighth/length criteria, and needs to be sent package rate (First Class Parcel or Media mail).If your book overhangs the paper edge on either the long or the short side, you have passed the length/heighth criteria, and you should then check the thickness of the book.Place your book on it so that the long side of your book is parallel to the long side of the paper, centering the book on the paper.Cut a sheet of printer paper to 6- 1/8 inches by 11-1/4 inches.To decide if First-Class Large Envelope (= First Class Flat) Rate will work for your book: If your book is very long, and thinner than 3/4 of an inch and also flexible in all dimensions, you can use large envelope rates, but this would be an exception: a large thin spiralbound book might fit the criteria, for example, but not a typical paperback, and no hardcover of any size would be considered flexible, of course.If your book is longer than 6-1/8 inches on its spine side, but this is NOT the short side of the book, then the dimensional criteria have not been met for First Class Large Envelope (= First Class FLATS) rate.Even some USPS employees are confused about this: you may get information from individual USPS employees that conflicts with the official information. ![]() This information can all be found on the website. Must have 1 inch flexibility in each dimension.Must be no more than 12 inches high x 15 inches long x 3/4 inch thick.LONG = the long side of your book (this is usually the spine side).HIGH = the short side of your book (if you stood it up on a table, with its spine on the table surface).Must have one dimension that is greater than 6-1/8 inches high OR 11-1/4 inches long.Size requirements to use Large Envelope rate: First Class Flat rate is also known as "First Class Large Envelope" rate. First Class Flat (= "First Class Large Envelope") rates are inexpensive, but books do not typically qualify as "flats" (flats are letters and other flexible materials, and Large Envelopes must exceed the size of letters, which are classified as a maximum of 6-1/8 inches by 11-1/4 inches). ![]()
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