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EVC11120

Auto-Bottom Box with Tuck and Tongue Lock

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

Pre-glued base pops open in one motion for fast packing
Tongue-lock top secures the lid without external seals
Delivered flat to save warehouse space before use

About this product

The EVC11120 is a corrugated folding carton built for fast manual packing and clean retail presentation. It features a pre-glued crash-lock base that pops open in one motion when squeezed, eliminating the need to fold or tape the bottom. The top closure uses a standard tuck flap enhanced by a front tongue tab that locks into the lid, providing a secure, tape-free finish.

This design shifts effort from the packing bench to the manufacturing stage. Because the base is usually pre-glued on a multi-point folder-gluer, it makes more sense for established repeat volumes than a manual snap-lock box, and it reduces assembly time for repeat fulfillment and kitting operations.

Common uses

Retail kitting
Repeat manual fulfillment
Subscription boxes

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High-Volume Fulfillment and Retail Kitting

Retail kitting and subscription programs

The clean, tape-free exterior and secure tongue lock make it a strong fit for unboxing experiences. The integrated lock keeps the lid closed on the shelf without requiring clear wafer seals.

Repeat manual fulfillment

The auto-bottom base allows packers to erect the box in one motion, reducing assembly time compared to folding and taping standard cartons. It is a practical choice for repeat packing lines.

Shelf-ready consumer goods

The integrated lock keeps the lid closed on the shelf without requiring clear wafer seals, maintaining a clean presentation for retail environments.

Inner master-carton packing

When multiple units are packed into a larger shipper, the tongue lock keeps individual cartons secure without adding tape bulk or slowing down the packing process.

E-Commerce and Shelf-Ready Consumer Goods

E-commerce fulfillment centers

Reduces packing labor while providing a secure closure. However, for rough parcel networks, an outer shipper or security seal may still be necessary to prevent the tongue lock from snagging on sorting equipment.

Retail distribution

The lack of external tape keeps branding and graphics uninterrupted on the store shelf. The tongue lock provides enough friction to keep the product contained during standard retail handling.

Contract packaging and 3PLs

When labor time is a primary constraint, the auto-bottom base allows packers to erect the box in one motion, increasing throughput for repeat fulfillment programs.

When to Consider Snap-Locks or Standard Shippers

Short runs or prototype testing

If the order volume is too low for the pre-glued production path, a manual 1-2-3 snap-lock bottom is a more practical starting point. It requires more packing labor but avoids complex gluing runs.

Heavy industrial transit

For very heavy goods, the glued joints of a crash lock may fail under extreme bottom loads. A fully taped regular slotted carton (RSC) or heavy-duty tray is often a safer choice for dense industrial parts.

Board Choice and Production Route

Board thickness and flute profile

This mechanism works well with thinner profiles like E-flute. Thicker boards, such as double-wall, can cause the crash-lock folds to bind and make the tongue lock too stiff for operators to easily engage.

Order volume and production path

The pre-glued base relies on multi-point gluing. Buyers should confirm their repeat volume justifies this production path compared to boxes that are shipped unglued.

Outer shipping requirements

While the tongue lock holds the lid closed, it can catch on sorting equipment in parcel networks. Decide if the carton will ship inside a master shipper or need a clear wafer seal.

Print surface and graphics

The tape-free closure leaves the main panels clear for uninterrupted branding. Consider how the tongue lock placement interacts with front-panel artwork.

Tongue Lock Clearances and Paired Layouts

Tongue lock width and insertion depth

The width of the locking tab and its receiving slot can be adjusted to balance security with ease of opening, depending on the board's stiffness and the intended unboxing experience.

Paired manufacturing layouts

For large production programs, the template can be nested in a paired layout to maximize material yield and reduce corrugated waste.

Dust flap clearances

The side dust flaps can be adjusted to prevent binding against the front wall, ensuring the lid closes smoothly without forcing the tongue lock out of alignment.

Packing details

Flute direction and vertical stacking

Ensure the flute direction runs vertically along the main walls to maximize top-to-bottom compression strength, especially if the boxes will be palletized.

Parcel sealing and outer carton choice

While the tongue lock holds the lid closed, it is not tamper-evident and can catch on sorting equipment. Consider a clear wafer seal or an outer master shipper for single-parcel transit.

Layout and Flap Variants

EVC11120#2

A minor flap and layout variation of the base design, offering the same auto-bottom and tongue-lock functionality.

EVC11120#2P

A paired layout that nests two identical blanks together on the corrugated sheet, improving material efficiency for large production programs.

Additional notes

Board thickness and lock friction

The effectiveness of the tongue lock depends heavily on the board caliper. If the board is too thick, the tab may tear when forced into the slot; if too thin, it may slip out. Always test the lock with the exact production material.

Outer shipping considerations

The tongue lock is not tamper-evident. If the carton is shipping directly through a parcel network, consider adding a clear wafer seal over the tongue tab to prevent it from catching on sorting belts.

FAQs

How much faster is a crash-lock bottom than a standard box?

A crash-lock base pops open and locks in a single motion, taking only a second or two. This is faster than manually folding four bottom flaps and applying tape, making it a practical choice for repeat packing lines.

Does the tongue lock eliminate the need for tape?

For retail display, kitting, and palletized transport, the tongue lock securely holds the lid closed without tape. However, for individual parcel shipping, a security seal or outer carton is recommended to prevent the tab from snagging or popping open during rough handling.

Why does this box require higher repeat volumes?

The crash-lock base is usually pre-glued by the manufacturer using a multi-point folder-gluer. The production path for this machinery makes very short runs less practical compared to boxes that are shipped unglued.

Can this design be made in heavy double-wall corrugated?

It is generally not recommended. Thick double-wall board makes the complex folds of the crash lock bulky, which can cause the box to bind when opening. It also makes the tongue lock difficult to insert. E-flute or B-flute are much better fits.

Can I get a short run of digital samples to test the lock?

Yes, digital cutting tables can produce samples to test the tongue lock's friction and the box's fit. However, the crash-lock bottom will need to be hand-glued for the prototype, which will not perfectly replicate the machine-glued tension of a full production run.

When should I choose a snap-lock bottom instead?

A 1-2-3 snap-lock bottom is a better choice for shorter runs where the pre-glued production path is prohibitive. It requires more time for the packer to assemble, but the manufacturing path is simpler.

Will the tongue lock tear after repeated opening?

The tongue lock is designed for secure closure rather than frequent reopening. While it can be opened and closed a few times, repeated use may weaken the tab or the receiving slot, especially in thinner boards.

How does the paired layout improve production?

For large production programs, the paired variant (EVC11120#2P) nests two blanks together on the corrugated sheet. This reduces corrugated waste and improves material efficiency, though it requires specific factory stripping.