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FEFCO 0321

Two-Piece Telescopic Snap-Lock Box

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

Both base and lid pop open and lock without tape
Full-depth lid creates double-wall side protection
Requires flatbed die-cutting for the complex locking tabs

About this product

This heavy-duty, two-piece package consists of a base tray and a full-depth lid, both featuring a self-assembling snap-lock bottom. Because both pieces arrive as pre-glued tubes, your team can pop them open and lock the floors into place instantly, without reaching for a tape gun.

You trade higher material usage and flatbed cutting requirements for exceptional packing speed and vertical stacking strength. Once the lid slides over the base, the overlapping walls create a continuous double-thick perimeter that resists crushing under heavy pallet loads.

Common uses

High-volume fulfillment
Heavy industrial parts
Retail goods needing clean presentation and strong stacking
Internal kitting and staging

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High-volume fulfillment and heavy stacking

High-speed automated fulfillment

Because the base and lid arrive as pre-glued tubes, they are highly compatible with automated case-erecting machinery. The machine pops the tube and folds the bottom flaps in one fluid motion, allowing for rapid deployment on busy packing lines.

Heavy palletized transport

When shipping dense goods stacked multiple layers high, the vertical walls bear the load. The full-depth lid creates a double-wall barrier around the entire perimeter, preventing the bottom boxes from crushing under the weight.

Rapid manual pack benches

For operations relying on hand assembly, this package eliminates the time spent squaring and taping eight different corners. Workers simply push the bottom flaps inward to lock the tray floor.

Internal kitting and staging

The fast assembly and removable lid make this a strong fit for internal material handling. Workers can quickly build the trays, load components, and use the friction-fit lid to protect parts from dust before final assembly.

Fulfillment centers, industrial staging, and retail distribution

Fulfillment centers

High-volume shipping operations benefit from the rapid deployment speed. The pre-glued tubes reduce pack-bench bottlenecks and integrate easily with automated tray erectors.

Industrial manufacturing

Facilities shipping dense metal or plastic components rely on the double-wall perimeter to maintain vertical stacking strength during long-haul transport.

Retail distribution

Brands shipping goods directly to retail floors benefit from a clean presentation. The mechanical lock eliminates the need for packing tape across the bottom panels, keeping the exterior visually clean.

When to consider taped corners or standard boxes

When using very thick corrugated board

The snap-lock mechanism relies on the board flexing slightly to engage. Heavy double-wall grades fight this fold memory, making manual assembly stiff and causing the bottom to bow. If you need extreme board thickness, a standard telescopic box with taped corners is often a safer choice.

When shipping individual parcels

The friction fit between the lid and base works well for stable pallets, but rough handling in a courier network will separate the pieces. If you want to avoid external strapping or tape, review a standard slotted container instead.

Close variants and lookalike dielines

The closest library neighbors include 0714a, 0714, 0331. Use this as a variant check if a buyer brings an old code, sample, or dieline that looks close. The deciding details are usually the lock, slot, closure, wall build, part count, or fold sequence.

Board thickness, closure, and production routing

Securing the lid for transit

While the top and bottom planes lock without tape, the final package relies on a friction fit between the lid and the base. For stable pallet loads, this is often enough. For individual parcel shipping, you will need to plan for external strapping or tape to prevent the lid from separating during rough handling.

Board thickness and lock stiffness

The interlocking tabs must bend to snap into place. Selecting a board that is too thick will make the assembly process difficult and risk tearing the tabs. We balance the required stacking strength with the flexibility needed for the lock to function.

Production routing and cutting

The intricate hooks and notches of the snap-lock bottom cannot be cut on standard rotary equipment. This package requires flatbed die-cutting, which means investing in two separate cutting dies for the base and the lid. This makes it more practical for larger, repeating runs rather than short trials.

Bottom pad inserts for heavy point loads

The snap-lock floor is strong, but concentrated heavy weights can force the unglued tabs to bow outward or pop open. Adding a simple flat corrugated pad inside the base distributes the weight across the entire floor, protecting the locking mechanism.

Modifying the lock, clearance, and print surface

Telescopic clearance gap

The internal dimensions of the lid must be precisely scaled to account for the external dimensions of the base and the thickness of the board. This clearance gap dictates the friction fit. This must be recalibrated if you change material grades.

Locking tab geometry

The swallowtail notches and hooks can be adjusted to match specific machine erectors or board calipers, ensuring the insertion friction is balanced with the retention strength.

Print surface utilization

The full-depth lid provides a large, uninterrupted surface for branding, handling instructions, or compliance labeling, keeping the primary graphics visible even when stacked.

Board and packing details

Production routing for short trials versus repeat runs

Because of the dual flatbed dies required, this package is an investment. It is highly efficient for large, repeating fulfillment programs, but less practical for short runs or early-stage prototyping where the dimensions might change.

Lid closure variants

Overlapping lid flaps (0321a)

Instead of a snap-lock ceiling, the lid features fully overlapping top flaps that require taping. This drastically increases top-drop protection and material usage, making it suitable for extreme heavy-duty applications.

Additional notes

Flatbed cutting requirements

The intricate bottom locks require flatbed die-cutting. This means investing in two separate cutting dies, making this package better suited for established, repeating product lines rather than short-run prototypes.

FAQs

Assembly and Closure

Does this box require any tape or glue?

The factory glues the side seams, delivering the pieces as flat tubes. The bottom flaps interlock mechanically without tape. However, shipping these individually through a courier network requires strapping or taping the lid to the base.

Product Fit and Weight

Can the snap-lock bottom hold heavy items?

It handles distributed weight well. Heavy, concentrated point loads can cause the interlocking tabs to bow or pop open. Packing dense metal parts often requires adding a flat bottom pad inside to distribute the weight evenly across the locks.

Board and Finish

Can we make this out of heavy double-wall board?

The snap-lock tabs need to flex to engage. Thick double-wall board is stiff, making manual assembly difficult and often causing the bottom to bulge outward. We usually recommend switching to a taped-corner style for double-wall strength.

Production and Tooling

Why does this style require specific cutting methods?

The interlocking swallowtail flaps require precise, angled cuts that standard slotting machines cannot make. This means the production route relies on flatbed die-cutting for both the base and the lid.

Fit and Clearance

Will the lid slide on easily?

The lid is intentionally scaled larger than the base, factoring in the exact thickness of the corrugated board. Changing the board grade later requires recalculating those allowances to prevent the lid from binding or fitting too loosely.

Packing Labor

Is this faster to pack than a standard box?

Because both pieces pop open and lock instantly, packers skip the time spent squaring and taping the bottom flaps of two separate pieces. This labor savings drives high-volume operations to choose this style despite the higher material usage.

Shipping and Route

Can we use this for individual courier shipments?

The final package relies on a friction fit between the lid and the base. This works for stable pallet loads, but rough handling in a mixed courier network will separate the pieces unless you apply external strapping or tape.

Delivery and Storage

How does this arrive from the manufacturer?

Both the base and the lid arrive as flat, pre-glued tubes. This keeps pallet volumes low while shifting the side-seam gluing labor to the factory.