Inner flap
The flap that folds in first. On slotted boxes the inner flaps sit on the width panels.
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Related terms
- Outer flap
- The flap that folds last and forms the outside of the closure. On slotted boxes the outer flaps sit on the length panels.
- Flap
- A part of the blank hinged on a score that folds over to close the top or bottom of a box.
- Center special slotted container (CSSC)
- A slotted box with inner flaps cut to half the length and outer flaps to half the width, so both pairs meet in the center.
- Fill-in pad
- A loose sheet of board laid between the inner flaps of a slotted box to give a flat, full floor.
Definitions written by Packgent, last reviewed 2026-10-27. All terms.