![]() Letters with nonpaper surfaces, other than envelope windows or attachments that are allowed ![]() It has a delivery address parallel to the shorter sideĬontains items such as pens, pencils, or keys that create an uneven thickness. Has clasps, strings, buttons, or similar closures. It is more than 4.25 inches high / more than 6 inches long / is less than 0.009 inch thick. The Postal Service charges extra postage because mailpieces that are rigid, square, or unusually shaped, often jam postal equipment and are difficult to process.Īn aspect ratio (length divided by height) of less than 1.3 or more than 2.5 (a square envelope has an aspect ratio of 1 and is non machinable). ![]() First-Class Mail letters that have a non machinable characteristic will have to pay a surcharge. ![]()
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