Custom Reverse Tuck End with Lock
A plain tuck flap relies on friction alone, which works until something presses against it. Adding a locking tab changes that. A small cut on the flap catches inside the panel, so the closure holds under pressure rather than springing open. We produce a lot of reverse tuck end with lock work at ZEE Packaging and it costs almost nothing to add.
A Tab That Catches
A reverse tuck end with lock holds through more than friction.
- A small tab on the flap catches inside the panel
- The closure resists pressure rather than popping open
- Nothing is glued or taped anywhere
- It still nests tightly, so board cost stays low
- The lock adds no separate component
- Assembly takes barely longer than a plain tuck
Most brands moving to a reverse tuck end with lock have had plain flaps spring open in a delivery box.
Where The Lock Earns Its Place
Some situations genuinely need it.
- Products with any real weight inside
- Cartons that get shipped rather than shelved
- Anything handled repeatedly by shoppers
- Powders or loose contents that must not escape
- Packs stacked with pressure on the flaps
- Unnecessary for very light items on a shelf
- Standard reverse tuck end with lock the everyday build
- Tongue lock version a larger catching tab
- Slit lock format the tab engaging a cut slot
- With a hang tab for peg display
- Window version showing product through a die cut
- Food grade version for direct food contact
Sizes We Print Regular
Every reverse tuck end with lock carton is built to your product, though these run often:
- 2" x 2" x 4" for a cosmetic tube
- 3" x 2" x 5" for pharma and blister packs
- 4" x 4" x 6" for a candle or jar
- 6" x 4" x 8" for a food carton
- 8" x 6" x 2" for a flat item
- 2.5" x 1.5" x 3.5" for small goods
Send us the filled weight, since the lock depth is specified against it.
Board And Print
- SBS C1S at 16pt to 24pt for most applications
- CCNB and duplex where a grey back is acceptable
- Kraft board for a natural or artisan position
- Matte, gloss and soft touch lamination
- Foil, spot UV, emboss and deboss available
- Food grade certified stock where required
The lock cut has to be precise. Too shallow and it does nothing, too deep and it weakens the flap, so we sample it rather than assuming.
Materials Worth Choosing
- Recycled board grades, widely available here
- FSC certified stock, certificate available on request
- Soy based ink through the whole run
- No glue on the closure, keeping recycling simple
- Aqueous coating rather than plastic lamination
- Right sizing so no board is wasted per carton
What Happens On Your Order
- 100 unit minimum, so a small brand can order properly
- Free 3D mockup and flat proof before anything prints
- Free dieline drawn by our own designer
- Physical sample on request to test the lock when filled
- Urgent turnaround at 5 to 8 business days
- Free shipping worldwide with nothing hidden
Frequently Asked Questions
How much does the lock add?
Very little per unit. It is a die cut feature rather than an extra component, so the cost difference is minimal.
How much does a locking reverse tuck end box cost?
Rough estimate is $0.14 to $0.45 per unit plain, $0.22 to $0.62 with print and $0.35 to $0.90 with finishing at moderate quantity. Volume moves it. Shipping is included in our price. This is estimate only, so ask our team for a exact quote.
Will it still pop open?
Far less readily than a plain tuck. For genuinely heavy contents we would still suggest a glued base.
Does it slow assembly?
Barely. Staff engage the tab as they tuck, which becomes automatic within a few cartons.
Which caliper should we choose?
16pt to 18pt for most retail. Heavier products need 20pt or above regardless of the lock.
Is it harder for customers to open?
Slightly, which is usually a good thing. It signals the pack has not been opened before.
Can we add a window?
Yes, patched with PET or compostable film. The lock does not affect where a window can sit.
