The Tuck Top Auto Lock Bottom Box — Snaps Open, Locks Flat, Packs in Seconds

If you're hand-packing hundreds of units a day, the tuck top auto bottom box is the one that saves your wrists. Its base ships pre-glued from the factory, so instead of folding a sequence of flaps you just push the flat blank into shape and the bottom snaps open and locks itself flat in one motion — then you drop the product in from the top and close the tuck flap. That auto-locking base (you'll also hear it called a crash-lock or 1-2-3 bottom) carries real weight with zero tape or glue at your end, which is why it's the go-to for cosmetics, supplements, coffee, vape, and e-liquid lines. One thing worth knowing before you print: the auto bottom needs a glue seam and a specific flap geometry to lock correctly, so the dieline matters more here than on a simple tuck carton — a few millimetres off and the base won't pop square. PackMyMan lays those glue flaps and lock angles out for you automatically at whatever size you set. If you'd rather tuck both ends by hand or use a glue-free mechanical lock instead, those styles are a click away — but if speed on the packing line is the priority, this is the carton. Set your length, width, and height and export a production-ready dieline in SVG, DXF, or PDF, ready for your printer or cutting table.