The U.S. Postal Service (USPS) generally separates shipping rates for different mail by weight. For example, the same stamp can send any letter - - as long as it weighs less than 3 ounces (85 grams). If your letter weighs more than that, you'll have to pay more to send it. If you want to send a package through the USPS Parcel Post, it can't weigh more than 70 pounds (32 kilograms) or be longer than 130 inches (330 centimeters) on its longest side.
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