Full Overlap Flap Carton — A Strong, Sealable Box You Can Size Yourself

The full overlap flap carton is the box you reach for when a tuck end just won't hold — instead of thin flaps folding into each other, all four base flaps overlap completely, doubling the board across the bottom so it can carry real weight and take glue or tape for a proper seal. The top uses a covering-flap closure, where reduced-size flaps fold in and one flap laps fully over the rest for a clean, closed face. That combination makes it a workhorse for heavier or shippable goods, subscription and e-commerce mailers, hardware, bottles, and anything a flimsy retail carton would sag under. It's essentially the paperboard version of a corrugated full-overlap slotted container — same overlapping-flap strength, lighter board. Because it's a long-seam glued Group A style (ECMA A10.11.03.03), it ships flat, glues up fast on standard folder-gluer lines, and stays dimensionally consistent from the first blank to the ten-thousandth. Set your length, width, and height, and you'll get a production-ready dieline with the overlap and covering flaps already laid out correctly.