Size and weight limitations

§ 4552. Size and weight limitations (a) Except as provided in subsection (b) of this section— (1) the maximum size of fourth class mail is seventy-two inches in girth and length combined, and (2) the minimum weight is sixteen ounces and the maximum forty pounds in the first and second zones and twenty pounds in any other zone. (b) The maximum size of fourth class mail is one hundred inches in girth and length combined and the minimum weight is sixteen ounces and the maximum seventy pounds for parcels— (1) mailed at, or addressed for delivery at, a second, third, or fourth class post office or on a rural or star route; (2) containing baby fowl, liveplants, trees, shrubs or agricultural commodities but not the manufactured products of those commodities; (3) consisting of books permanently bound for preservation consisting wholly of reading matter or reading matter with incidental blank spaces for students’ notations and containing no advertising matter other than incidental announcements of books; (4) addressed to or mailed at an Army, Air Force, or Fleet post office; (5) addressed to or mailed in the Commonwealth of Puerto Rico, the Territory of Hawaii or a possession of the United States including the Canal Zone and the Trust Territory of the Pacific Islands; and (6) consisting of reproducers for sound reproduction records for the blind or parts thereof, and of Braille writers and other appliances for the blind or parts thereof, mailed under section 4654 of this title.