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EVC11020

Snap-Lock Box with Tongue Closure

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

Positive tongue-and-slot top lock prevents accidental opening
1-2-3 snap-lock bottom holds medium weights using interlocking flaps
Delivered flat with a pre-glued side seam for manual assembly

About this product

The EVC11020 is a corrugated folding carton designed for secure presentation. It combines a 1-2-3 snap-lock bottom with a positive tongue-and-slot top closure, making it resistant to accidental opening on retail shelves or in storage bins.

Because the bottom flaps interlock manually and the top lid anchors mechanically into the front panel, this box offers a clean, reusable finish. The main tradeoff is packing speed: the snap-lock base involves manual folding, making it a better fit for hand-packing operations than automated erecting equipment.

Common uses

Retail shelf packaging
Parts kitting and storage
Medium-weight consumer goods
Subscription and presentation kits

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Retail, Kitting, and Storage Applications

Retail Shelf Display

The mechanical top lock keeps the lid flush and secure, providing a clean presentation for consumer goods. The tongue prevents the lid from bowing outward, even if the box is handled frequently by shoppers.

Parts Kitting and Storage

The tongue-and-slot closure is designed for repeated opening and closing, making it useful for hardware, spare parts, or multi-piece kits that users access over time.

Subscription and Presentation Kits

The clean top closure and easy reopening make this a strong candidate for multi-item kits where the unboxing experience matters and the recipient may keep the box.

Hardware and Component Packaging

The snap-lock bottom provides better floor support than a standard tuck bottom, making it suitable for heavier metal or plastic components that might otherwise push through a simple friction closure.

Hand-Packing and Presentation Environments

Hand-Packing Operations

Since the 1-2-3 bottom involves an operator folding and interlocking four flaps, this box fits fulfillment centers set up for manual assembly rather than automated erecting equipment.

Reusable Storage Environments

When the end-user is expected to keep the box to store the product over time, the mechanical tongue lock provides a reliable closure that does not degrade as quickly as a simple friction tuck.

Retail and Point-of-Sale

Environments that value a clean, adhesive-free appearance benefit from the flush lid and hidden bottom locks, keeping the focus on the printed graphics.

When to Consider Faster or Simpler Alternatives

High-Volume Fulfillment

If packing speed is the primary concern, a crash-lock (auto-bottom) box opens in a single motion, eliminating the manual bottom-folding steps while retaining a similar top closure.

Individual Parcel Shipping

Mechanical locks can disengage during rough courier transit. For individual parcel delivery, consider a standard mailer or plan to use an outer shipping box or security seal.

Board Thickness, Print, and Route Considerations

Board Thickness and Lock Fit

The width of the top slot should be calibrated to the board's caliper. Thinner profiles like E-flute or B-flute work well, while heavy double-wall boards can cause the tongue to bind or tear during closure.

Print Placement on the Lock

Heavy ink coverage or varnish directly on the locking tongue or slot hinge should be reviewed, as the friction of opening and closing can crack the finish.

Hand-Packing Speed vs. Pre-Glued Automation

Buyers should weigh the slower manual assembly of the 1-2-3 bottom against the faster packing speed of a pre-glued crash-lock bottom, especially for larger repeat orders.

Shipping Route and Outer Packaging

If the box will be shipped individually through parcel networks, an outer seal or master carton is often necessary to prevent the mechanical locks from catching and opening.

Adjusting the Lock and Flap Clearances

Tuck Flap Depth

The depth of the top tuck flap can be extended for heavier products to provide more friction before the tongue lock engages.

Tongue and Slot Width

The dimensions of the locking tongue and the corresponding slot can be adjusted to match specific board grades, ensuring a smooth but secure fit.

Dust Flap Coverage

The top dust flaps can be widened to provide more coverage across the opening, which helps prevent smaller items from slipping out and adds rigidity to the top of the box.

Packing details

Prototype Testing for the Top Lock

Because the tongue-and-slot mechanism relies on exact board thickness, a physical prototype is advised to verify that the lid closes smoothly without excessive force.

Additional notes

Board thickness and slot clearance

The slot in the lid hinge is calculated based on the exact material thickness. If you change board grades later, the template should be adjusted so the tongue does not bind or slip.

FAQs

How does the top tongue lock work?

A small tab extends from the top of the front panel. When you fold the lid down and insert the tuck flap, this tab slides through a pre-cut slot in the lid's hinge, locking the top in place mechanically.

Is the 1-2-3 bottom faster to pack than a standard slotted box?

It is generally faster than taping a standard slotted box, but slower than a crash-lock (auto-bottom) box. The operator folds and interlocks the four bottom flaps before loading.

Can this box be shipped through parcel networks without an outer seal?

It is generally not advised. While the tongue lock is secure for retail and storage, rough handling in courier networks can cause mechanical locks to disengage. Parcel shipments often benefit from an outer seal or a master shipper.

What board types make sense for this closure?

Thinner corrugated profiles like E-flute or B-flute are often preferred. The locking slot is cut to match the board thickness, and very thick boards can make the tongue difficult to insert or prone to tearing.

Is the tongue-and-slot closure tamper-evident?

No. While it prevents accidental opening and provides a secure hold, it can be opened and reclosed without visible damage. Tamper evidence typically involves an additional security label over the closure.

How is this box delivered to the packing facility?

It is delivered flat. The manufacturer die-cuts the shape and glues the side seam, so it arrives as a collapsed tube ready to be opened and assembled at the packing bench.

Can the tongue lock handle repeated opening and closing?

Yes, it is designed for reusability. However, the longevity depends on the board grade and how carefully it is handled. Over time, the friction can soften the edges of the tongue.

Does the snap-lock bottom support heavy items?

It supports medium weights better than a simple tuck bottom because the flaps interlock to form a floor. For very heavy items, a taped bottom or a crash-lock bottom may provide more reliable support.