A center special slotted box is similar to a regular slotted box, except that it is stronger at the top and bottom due to the double thickness of corrugated board in these areas. The inner flaps, meeting as they do, provide a level rest for the contents of the box.

A variation of the center special slotted box is the side special slotted box- SSS. In this box, all the flaps also meet, but not at the center