One or more pieces of combined board provide an unbroken surface and are scored to fold around the product. The most common is a one-piece folder, where one piece of board is cut so that it provides a flat bottom, flaps that form the sides and ends, and extensions of the side flaps that meet to form the top.
This style is also available as a five-panel folder, which is a single cut and scored piece with a fifth panel used as a closing flap, completely covering a side panel.