Machinable Parcel
A mail processing category for a mailpiece that is not less than 6 inches long, 3 inches high, ¼ inch thick, and 8 ounces in weight. The mailpiece cannot be more than 34 inches long, 17 inches high, 17 inches thick, and 35 pounds in weight (except for books and printed matter, which must not weigh more than 25 pounds). This mail can be safely sorted by mail processing machinery such as a parcel sorting machine.