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EVC41220

Full Telescope Box with Interlocking Corners

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.
Widest machinery capability in America via 30+ specialist partner plants.

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Product details

Top highlights

Two-piece design with a full-depth friction-fit lid
Assembles manually via interlocking corner slits
Delivers flat to maximize inbound freight and storage space

About this product

This two-piece corrugated box features a separate base and full-depth lid that assemble entirely without glue or staples. Instead, the walls fold up and lock together using intersecting corner slits, creating a rigid tray that ships completely flat.

Because the lid slides entirely over the base, the assembled box provides double-wall thickness on all four sides. This makes it an excellent choice for heavy-duty storage, reusable kitting, or presentation packs, provided your packing team has the time for manual corner assembly.

Common uses

Archival storage
Heavy parts kitting
Premium unboxing
Reusable internal transport

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Storage, Kitting, and Presentation Uses

Archival and Heavy-Duty Storage

The full-depth lid creates a double wall of corrugated board around the entire perimeter. This provides vertical stacking strength for heavy documents, parts, or records that need to be stored long-term and accessed repeatedly.

Premium Unboxing and Presentation

Because the corners lock mechanically without visible glue seams or wire stitches, the assembled trays have a clean, deliberate look. The removable lid allows for a full reveal of the product inside.

Reusable Internal Transport

The friction-fit lid and durable corners allow the box to be opened and closed multiple times. This makes it useful for moving parts between workstations or facilities without degrading a glued closure.

Heavy Parts Kitting

The flat, unobstructed base easily accepts foam pads or corrugated partitions. Combined with the double-wall perimeter, it contains heavy grouped components securely.

Manual Packing and Reusable Transport

Manual Packing Environments

This box is designed for hand assembly at the packing bench. It arrives flat, saving warehouse space, and is erected on demand. It is not compatible with automated tray-forming equipment.

Space-Constrained Operations

Storing flat blanks takes up far less room than storing pre-glued trays. This design maximizes inbound freight efficiency and warehouse density.

Closed-Loop Supply Chains

For operations that recover and reuse their packaging, the mechanical corners can be carefully unlocked to store the box flat again between uses.

When to Consider Glued or Stitched Alternatives

High-Volume Fulfillment Lines

Folding and locking eight corners per box takes time. If you are packing hundreds of orders a day, a standard glued telescope box or an auto-bottom design will reduce your labor costs.

Rough Parcel Networks

The lid relies on friction to stay in place. If this box is shipping individually through a courier network, it will need an outer seal, strapping, or shrink wrap to prevent the lid from detaching during transit.

Board Thickness, Assembly Labor, and Transit Sealing

Matching Board Caliper to the Notch Locks

The interlocking corner slits are cut to match a specific board thickness. If you change from a thin E-flute to a thicker B-flute without updating the cutting die, the locks will either tear during assembly or fail to hold.

Lid Clearance and Friction Fit

The lid is intentionally sized slightly larger than the base to allow it to slide on smoothly. The tightness of this gap can be adjusted before production to ensure the lid stays on during handling but remains easy to remove.

Assembly Labor vs. Pre-Glued Trays

Decide if the time spent locking eight corners is worth the savings in flat shipping and glue-free production. A physical sample helps evaluate the packing rhythm.

Transit Sealing Strategy

Plan how to keep the friction-fit lid secure during rough handling. Discuss whether strapping, shrink wrap, or an outer shipper makes sense for your route.

Adjusting the Lid Fit and Lock Tightness

Thumb Notches for Easier Access

Half-moon cutouts can be added to the sides of the lid. This gives users a place to grip the base while pulling the lid upward, making it easier to open tightly fitted boxes.

Adjusting the Friction Fit

The clearance between the lid and base can be modified. A tighter gap provides more security for storage, while a looser gap allows faster removal for frequent access.

Changing Board Flute Profile

Switching board grades requires updating the cutting die. The corner locks must be recalibrated to match the new material thickness so they engage smoothly.

Packing details

Flatbed Die-Cutting Requirements

The angled slits required for the corner locks mean this package is produced on a flatbed die-cutter. It cannot be run on simpler rotary slotting equipment.

Additional notes

Board thickness and lock failure

The width of the corner slits must exactly match the thickness of the corrugated board. Changing board suppliers or flute profiles without adjusting the cutting die will cause the corners to bind or tear.

FAQs

How long does it take to assemble this box?

Because both the base and the lid require folding and interlocking four corners each, assembly is slower than a standard glued box. It is well-suited for lower-volume packing, kitting, or situations where flat-shipping space is more valuable than packing speed.

Can I ship this box through the mail without an outer seal?

The lid is held on by friction. While it stays closed well on a pallet or a shelf, individual parcel shipping usually needs an outer seal, strapping, or a secure label to keep the lid from detaching during rough handling.

What board types perform well for interlocking corners?

Thinner boards like E-flute or B-flute fold crisply and allow the notch locks to engage smoothly. Heavy double-wall boards are often too thick and stiff for manual slit-lock assembly.

Will the lid be too tight to remove?

The lid is manufactured with specific gap allowances to clear the folded corners of the base. A physical sample should always be tested with your chosen board grade to ensure the friction fit is neither too tight nor too loose.

Does this box require a cutting die?

Yes. The angled slits that form the corner locks mean this package is produced on a flatbed die-cutter.

Can I use custom inserts with this box?

Yes. The flat, unobstructed interior of the base tray is an excellent foundation for foam pads, molded pulp, or corrugated partitions, making it a popular choice for kitting multiple parts.

Can this box be reused?

Yes. The friction-fit lid and mechanical corners allow repeated opening and closing without degrading a glued seam, making it useful for internal transport or closed-loop supply chains.

Why choose this over a standard glued telescope box?

It ships completely flat, saving inbound freight and storage space, and eliminates glued joints that might fail in certain environments. The tradeoff is the manual labor required to lock the corners.