Flap
A part of the blank hinged on a score that folds over to close the top or bottom of a box.
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Related terms
- Inner flap
- The flap that folds in first. On slotted boxes the inner flaps sit on the width panels.
- 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.
- Slot
- The narrow cut between adjacent flaps on a slotted blank, so the flaps can fold independently.
Definitions written by Packgent, last reviewed 2026-10-27. All terms.