
Corrugated Box
One Piece Folder (OPF)
The One Piece Folder is made from a single unglued sheet of corrugated board with a flat bottom panel, end flaps, and side flaps that fold over to form the top of the box. The side flaps overlap on top to create the closure. Some versions include self-locking tabs that click into place without tape, while standard versions use tape to secure the overlapping flaps.
OPFs are designed specifically for flat, shallow-depth items.
