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There are many standard corrugated box styles that have been established, but boxes can still be custom designed to satisfy unique customer needs. The standard box styles have been grouped into six categories. Slotted boxes are usually made from a single piece of board with a single vertical manufacturer's joint, and flaps that fold to form the top and bottom. Telescope boxes are made from two or three pieces of board, and consist of a top and a body, and sometimes a separate bottom. Folders are made from a single piece of board that is scored to fold around the product. These boxes feature a solid, unbroken bottom. Ridged boxes or bliss boxes consist of a folder type box, plus two identical panels that are attached to the ends. Self-erecting boxes are made from a single piece of board that is scored and slotted so that the box can be easily set up. And interior forms, including liners, dividers, and pads are added to boxes to separate or cushion products, strengthen the box, or prevent product movement.