This style of slotted corrugated box is similar to the regular slotted box, except that the outer flaps overlap a specified amount but not less than 1 inch. (See full overlap slotted container- FOL.) The inner flaps do not meet.

This box is easily closed, usually with staples driven through the overlap area. This style is used when the relationship between length and width results in an excessively long gap between the inner flaps, making it desirable to overlap the outer flaps to prevent them from spreading apart.