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EVC11920

Hook-Lock Top Box with Snap 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.
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Product details

Top highlights

Mechanical interlocking top closure
1-2-3 snap bottom for manual assembly
Practical fit for retail, kitting, and palletized transport

About this product

The EVC11920 is a corrugated box designed for mechanical closure and repeated use. It combines a fast-erecting 1-2-3 snap bottom with a specialized interlocking top, where a shaped tongue catches securely inside a slotted hole.

Because it closes cleanly using friction, this style is a practical fit for retail presentation, internal kitting, and reusable storage. However, the exposed top tabs mean it should be overpacked or sealed if entering a mixed-carrier parcel network.

Common uses

Retail product packaging
Internal fulfillment and kitting
Reusable storage boxes for parts
Subscription and sample kits

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Retail, Kitting, and Reusable Storage

Retail Presentation and Shelf Display

The mechanical top closure provides a clean, professional appearance without the visual clutter of adhesive seals. It allows customers or retail staff to open and reclose the box easily without destroying the packaging.

Internal Kitting and Fulfillment

For operations that build multi-part kits, the interlocking top allows workers to load, check, and secure the box multiple times during the assembly process. The snap bottom sets up quickly by hand at the packing bench.

Reusable Parts Storage

Because the interlocking tongue and slot do not rely on degrading adhesives, the box can be opened and closed repeatedly, making it useful for organizing components or storing items that require frequent access.

Subscription and Sample Kits

The unboxing experience benefits from the mechanical hook lock, which presents a neat exterior. The internal tabs on the dust flaps can also help retain a top pad or partition, keeping sample items organized during transit.

Fulfillment and Presentation Environments

Manual Packing Operations

This box is designed for hand assembly. The snap-lock base and interlocking top require manual folding and insertion, making it a poor fit for automated erecting equipment but practical for manual pack stations.

Palletized Distribution

The interlocking top is secure for palletized freight and retail handling where boxes are stacked and wrapped together, protecting the exposed top tabs from catching on adjacent items.

Multi-Step Assembly Lines

When a product moves through several workstations before final closure, the hook lock allows the box to be temporarily closed and reopened without applying and cutting seals at each step.

When to Consider a Sealed or Tuck-Top Alternative

High-Speed Automated Packing

If your volume requires automated case erectors and sealers, a standard Regular Slotted Container (RSC) is a better choice. The complex folds of the hook lock and snap bottom are difficult to automate.

Heavy Industrial Payloads

While the snap bottom holds moderate weight, very dense or heavy products can cause the unsealed base to bow or fail. For heavy goods, a stitched or sealed bottom provides better base retention.

Rough Courier Transit

If the box will ship individually through a mixed-carrier network, the exposed top tabs can catch on sorting belts. In these cases, consider a sealed RSC or a secure outer shipper.

Board Thickness, Print, and Transit Preparation

Flute Profile and Board Thickness

The hook-lock mechanism relies on precise clearances to function smoothly. Thinner profiles like E-flute or B-flute fold crisply and allow the tongue to insert easily. Thicker boards, such as C-flute or double-wall, can cause the lock to bind or tear during assembly.

Print Layout Across the Closure

If your design includes graphics that span the top of the box, note that the interlocking flaps overlap. The artwork must be planned around the visible tongue and the slotted hole to ensure proper alignment.

Packing Line Setup

Because the 1-2-3 bottom and hook lock require manual folding, evaluate your packing labor capacity. If speed is the primary concern, a crash-lock (auto-bottom) box may be faster to erect, though it requires a different gluing process.

Transit and Outer Packaging

Decide whether this box will act as the primary shipping container or an inner retail carton. If it ships individually, you may need to add a clear wafer seal over the hook lock to prevent it from catching on transit equipment.

Modifying the Lock and Base Clearances

Lock Friction and Clearance

The tightness of the top closure can be adjusted by modifying the width of the tongue relative to the slot. A tighter fit increases security but requires more effort to open, while a looser fit speeds up packing but may release under tension.

Dust Flap Tab Modifications

The internal tabs on the top dust flaps can be extended or removed depending on whether you need them to hold a top pad in place or if you prefer a simpler folding motion.

Base Snap-Lock Proportions

The geometry of the 1-2-3 bottom flaps can be adjusted to accommodate different box widths, ensuring the final tuck flap snaps securely under the side panels without bowing.

Packing details

Die-Cutting and Production Route

The angled cuts of the snap bottom and the internal slot of the top closure require flatbed die-cutting. This box is typically produced via flatbed die-cutting rather than standard rotary slotting.

Additional notes

Board thickness and lock binding

The clearances between the tongue and the slot are calculated based on the board thickness. Changing the flute profile later in the project will require adjusting the die-cutting template to ensure the lock still functions.

FAQs

Does the bottom of this box need adhesive sealing?

The 1-2-3 snap bottom is designed to interlock and hold moderate product weight using mechanical friction. However, for heavy items or rough transit, adding an adhesive seal can prevent the base from bowing.

How does the top hook lock work?

The top consists of two overlapping main flaps. One flap has a rectangular slot, and the other has a shaped tongue with lateral hooks. When folded down, the tongue inserts into the slot, and the hooks catch under the edges to hold the box closed.

Can I ship this box through a parcel courier?

Shipping this box individually through a mixed-carrier network is risky without modifications. The exposed tabs of the top lock can catch on sorting equipment. For parcel shipping, it should be placed inside an outer carton or securely sealed flat.

What board thickness fits the hook lock?

Thinner corrugated profiles, such as E-flute (1.5mm) or B-flute (3.0mm), fold more cleanly. They allow the intricate cuts of the tongue and slot to interlock without binding. Thicker boards often make the closure difficult to assemble.

Is this box suitable for automated packing lines?

Both the snap-lock bottom and the interlocking top require complex, multi-axis folding that is typically done by hand at a packing bench.

Should I request a physical sample before ordering?

A physical prototype helps test the friction of the hook lock with your chosen board grade, and verifies that the snap bottom can support your specific product weight.

How do the internal tabs on the top dust flaps function?

The top dust flaps feature small cutouts that fold inward. These tabs can be used to help retain a top pad or partition, keeping internal components secure when the box is closed.

Can the hook lock be opened without damaging the box?

Yes, the hook lock is designed for repeated opening and closing. As long as the board is not too thick and the lock is not over-tensioned, the tongue can be removed from the slot without tearing the corrugated material.