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EVF11080

Reverse Tuck Carton with Locking Bottom

Available in a wide range of custom configurations & material selection.
Order 1 sample. Or order 100K+ units. Or anything in between.
Affordable delivery across North America.
Design support, warehousing, testing, assembly available.
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Product details

Top highlights

Tongue-in-slot bottom lock for secure weight retention
Standard slit-lock top for easy consumer access
Delivered flat and pre-glued for rapid assembly

About this product

This folding carton combines a standard top tuck with a specialized locking bottom. The bottom closure uses a trapezoidal tab that seats into a dedicated slot, providing a positive mechanical lock that holds more weight than a standard friction tuck.

Delivered flat with a pre-glued side seam, it opens quickly for loading. The reverse-tuck layout, where the top and bottom closures hinge from opposite panels, makes it very efficient to cut while keeping the top easy for consumers to open.

Common uses

Retail cosmetics in glass jars.
Pharmaceutical bottles.
Light consumer electronics.
Kitted retail goods.

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Size and quantity

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Materials and print

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Retail Packaging and Secure Shelf Display

Retail Packaging

The secure bottom lock ensures the product stays enclosed when lifted off the shelf, while the clean main panels offer excellent branding space.

Kitting and Fulfillment

The pre-glued tube opens easily, and the bottom lock engages quickly by hand, making it practical for manual packing lines that need more security than a standard tuck provides.

Heavy Jar Enclosures

The tongue-in-slot lock supports heavier glass jars and bottles better than friction tucks, reducing the risk of the bottom opening under product weight.

Vertical Shelf Display

The flat base and clean panels support upright retail presentation, keeping the primary branding facing the consumer.

Cosmetics, Pharmaceuticals, and Consumer Goods

Cosmetics and Personal Care

Provides a premium feel with a secure base for glass bottles or heavier jars that might push through a standard friction tuck.

Pharmaceuticals and Supplements

The secure bottom keeps heavier bottles safely enclosed, while the top tuck allows for easy, repeated consumer access.

Specialty Food and Beverage

Useful for kitted bottles or heavy jars that need secure bottom retention without relying on external tape.

When to Consider Standard Tucks or Crash-Lock Bottoms

Standard Friction Tucks

If the product is very light and bottom security is not a concern, a standard reverse tuck may be simpler and slightly faster to assemble.

Crash-Lock Bottoms

For very high-volume manual packing, an auto-bottom carton sets up faster than folding and inserting a locking tab, though it requires more complex factory gluing.

Board Caliper, Print, and Packing Line Planning

Board Caliper and Flute

Designed primarily for folding boxboard or solid bleached board. If moving to micro-flute corrugated, the lock dimensions and crease clearances must be adjusted to prevent the tabs from binding.

Packing Method

While the side seam is glued automatically, the bottom lock requires a specific folding motion. Confirm whether your packing line will erect this manually or if automated cartoning equipment can handle the tongue-in-slot motion.

Print Surface Orientation

Because this is a reverse tuck, the top lid hinges from the back panel and the bottom lid hinges from the front. This affects how raw board edges are presented on the shelf and should be factored into the artwork layout.

Closure Security Needs

Evaluate if the mechanical tongue-in-slot lock provides enough security for the product weight, or if tamper-evident labels are also required for retail compliance.

Tuning the Bottom Lock and Top Friction Fit

Locking Tab Depth

The depth of the bottom slot and the length of the locking tab can be adjusted based on the board thickness and the required holding strength.

Top Friction Fit

The small slit locks on the top tuck can be tuned to make the lid easier to open or more resistant to accidental popping.

Slot Width and Taper

The receiving cut can be widened or tapered to match the chosen board thickness, ensuring the tab inserts smoothly without tearing.

Packing details

Print Panel Orientation

Additional notes

Raw edge visibility on reverse tucks

Because the top and bottom flaps hinge from opposite panels, one raw edge of the board will face the front of the package, usually at the bottom. If a completely unbroken front panel is required, a straight tuck design may be a better choice.

FAQs

Does this carton need tape or glue to stay closed?

No. The side seam is glued before delivery. The bottom uses a mechanical tongue-in-slot lock, and the top uses a friction tuck. Tape or wafer seals are only needed if you require tamper evidence.

Can this box be used as a shipping mailer?

No. Despite the 'mailer tuck' name for the bottom closure, this is a folding carton designed for retail shelves or inner packing. It requires an outer corrugated box for parcel shipping.

How much weight can the bottom lock hold?

The tongue-in-slot design holds more weight than a standard friction tuck, but the exact limit depends entirely on the board grade chosen. Heavy items like large glass jars should be tested with a physical sample.

Why choose a reverse tuck over a straight tuck?

Reverse tucks, where the top and bottom flaps hinge from opposite sides, nest much more efficiently on a master printing sheet, reducing material waste and improving sheet yield.

Is this carton suitable for automated packing lines?

The side seam is standard for straight-line folder-gluers. However, the specialized bottom lock requires a specific insertion motion. If you use automated cartoning equipment, verify that it can handle this specific tongue-in-slot closure.

What changes if I use a thicker board?

Thicker materials require adjustments to the crease allowances and the width of the bottom receiving slot. If the slot is too narrow for a thick board, the bottom lock will bind and tear during assembly.

How does the bottom lock affect manual assembly speed?

Folding the trapezoidal tab and seating it into the slot takes slightly longer than closing a standard friction tuck, which should be factored into manual packing times.

Can I use this carton for heavy mechanical parts?

While the tongue-in-slot lock is stronger than a standard tuck, heavy metal parts may still tear the board or slot. A physical test is necessary, or an outer corrugated shipper may be needed.