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EVF11099

Adjustable Telescopic 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

Adjustable length via a ratcheting side-locking tab
Requires two separate blanks and manufacturing setups
Relies on an external seal or outer shipper for parcel distribution

About this product

The EVF11099 is a two-piece adjustable folding carton designed to pack variable-length products using a single package size. It consists of an inner tube and an outer tube that slide together, featuring a ratcheting side-locking system that secures the box at specific extended lengths.

While this approach reduces the number of box sizes you need to stock, it requires two separate manufacturing setups and manual assembly to mate the tubes. Because the locking tab can disengage under tension, an outer shipper or external seal should be evaluated for parcel distribution.

Common uses

Posters and rolled prints
Umbrellas and long hardware
Variable-length retail kits

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Product Fits for Adjustable Telescopic Cartons

Variable-Length Retail Products

Useful for items like posters, rolled prints, umbrellas, or hardware where product length varies but width and depth remain constant. The ratcheting lock allows a single box inventory to cover multiple product sizes while maintaining a clean, retail-ready appearance.

Consolidated Fulfillment Operations

Useful in fulfillment centers that want to reduce packaging SKUs. Packers can slide the outer tube to match the exact length of the item, reducing internal void space. However, the labor required to mate the two tubes must be factored into the packing line speed.

Rolled and Cylindrical Goods

Posters, prints, and mats that vary in length but share a common diameter benefit from the sliding fit, keeping the item from shifting axially.

Hardware and Tool Kits

Long items like umbrellas, levels, or adjustable brackets fit well, provided the board grade matches the product weight.

Retail and Fulfillment Environments

Direct-to-Consumer Parcel Shipping

If this box ships individually, the side-locking tab is not enough on its own. Axial tension can cause the tab to disengage. An outer shipper, shrink wrap, or a strong label over the joint helps keep the package closed during parcel distribution.

Retail Shelf Display

The clean lines and hidden inner tube provide a uniform presentation on the shelf, even when housing products of different lengths.

Low-Volume Variable Production

For manufacturers producing many slight length variations of a single product line, this adjustable approach reduces the number of unique packaging SKUs required in inventory.

When to Evaluate a Different Box Style

Heavy or Bulky Items

This template uses folding carton board. If the product is heavy enough to require corrugated board, the tight clearances and small locking tab will not function well. A dedicated corrugated telescopic box should be evaluated instead.

High-Speed Automated Packing

Mating the two tubes and engaging the lock is a manual process. If your packing line requires fully automated loading and sealing, a single-piece box or a wrap-around carton is a better fit.

Single-Length High-Volume Runs

If you only pack one specific length, the dual manufacturing setup and manual mating labor add unnecessary steps. A standard straight tuck carton is more efficient.

Self-Sealing Fulfillment Needs

Because the locking tab can disengage under tension, this box relies on an external seal for parcel shipping. If a self-sealing closure is required, consider a different mailer style.

Fit, Board, and Route Choices

Dual Manufacturing Path and Volume

Because this package consists of two distinct parts, it requires two separate cutting dies and two folder-gluer setups. The order volume must justify the dual manufacturing path compared to sourcing multiple sizes of a simpler box.

Clearance and Board Thickness

The sliding action relies on a precise clearance gap between the inner and outer tubes. This gap depends on the exact board caliper and any surface coatings. Physical prototypes help ensure the tubes slide smoothly without being too loose.

Closure Method for Transit

Decide early how the box will be sealed if shipping via parcel networks. Shrink wrap or a heavy-duty label over the joint will affect the final presentation and packing labor.

Print Registration Across Tubes

Because the extension length varies, continuous graphics across the joint will not align perfectly. It is usually better to place primary branding on the outer tube or use repeating patterns on the inner tube.

Adjusting the Locking Mechanism

Locking Hole Spacing

The distance between the locking holes on the inner tube can be adjusted. This determines the length increments at which the box can be locked. Closer spacing offers finer adjustment, while wider spacing simplifies the die-cut.

Thumb Cut Dimensions

The thumb cuts on the outer tube can be resized to provide more or less grip access for packers adjusting the inner tube.

Locking Tab Width and Depth

The tab on the outer tube can be widened or deepened to adjust how firmly it seats into the locking holes, balancing retention strength with ease of manual assembly.

Packing details

Notched Glue Flap for Locking Holes

The inner tube features a notched glue flap. This allows the tube to be glued securely without blocking the row of locking holes. The folder-gluer must be set up to apply adhesive only to the solid segments to prevent glue from slinging through the gaps.

Additional notes

Thumb cuts for adjustment

The open rim of the outer tube includes small thumb cuts. These expose the inner tube, making it easier for packers to grip and adjust the length before engaging the lock.

FAQs

How does the side-locking system work?

The inner tube has a series of holes cut along one corner. The outer tube has a protruding tab on its open rim. Once the tubes are slid together to the desired length, the tab is pressed inward to catch in the nearest hole, locking the length in place.

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

The locking tab holds the tubes together for handling and retail display, but it can disengage if the box is pulled or flexed. An external seal or outer shipper should be evaluated for individual parcel distribution.

Does this box require two cutting dies?

Because the inner and outer tubes are completely different flat shapes, they require separate cutting dies and separate runs through the folder-gluer.

Can I use corrugated board for this approach?

This specific locking mechanism is designed for thinner folding carton board. Corrugated board is generally too thick for the small locking tab and tight sliding clearances to work reliably. If you need corrugated, a different telescopic template is required.

Are the two tubes delivered already assembled?

Typically, the inner and outer tubes are glued flat and delivered as separate knocked-down bundles. They are opened, loaded, and mated together at the packing station.

How do I ensure the tubes slide together easily?

The clearance between the tubes must be calculated based on the exact board thickness and any surface finishes. A physical prototype should always be tested to confirm the fit is neither too tight to slide nor too loose to hold its shape.

How do graphics align between the inner and outer tubes?

Since the length varies, continuous patterns or registered graphics across the joint are difficult. It is usually better to keep primary branding on the outer tube or use repeating patterns on the inner tube.

What board types work well for this sliding mechanism?

Solid bleached sulfate or folding box board provide the smooth surface and rigidity needed for the tubes to slide easily and the tab to hold its shape.