The One-Piece Folder (1P-F) is made from one piece of material and has a flat bottom with flaps that form the sides and ends. The outer flaps meet at the center to form the top. 1P-F's can be made with multiple scores so that one box can be folded to make up to three different size boxes. The 1P-F is used principally for shipping books, catalogs, videos, and similar items. 1P-F's are easy to store, set up, and close.