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The four flaps that form the bottom panel are die cut. To set up, the user folds the largest bottom panel first, then the two end panels. When the remaining bottom panel is folded and pressure is applied near the center, the flap “snaps” into the slot created by the other panels. The style is convenient for small-volume shippers who do not have automatic set-up equipment. Because the bottom is not fully sealed, it may not be suitable for heavy products.
