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EVC71003

Corrugated U-Channel Box Insert

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

Drops into a master carton; not a standalone box
Glueless manual assembly for fast packing
Flat ledge or angled presentation flap options

About this product

This one-piece corrugated insert drops into a master carton to create a false bottom, an angled presentation ramp, or a reinforced double-wall perimeter. It folds quickly by hand without glue or tape, relying on the tight fit of the outer box to hold its shape.

A built-in thumb cut allows the end-user to easily lift the insert out, making it useful for unboxing experiences, layered kitting, or separating heavy components from fragile accessories.

Common uses

False bottoms for unboxing
Angled presentation ramps
Perimeter crush reinforcement
Void fill for top-heavy boxes

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False Bottoms, Layering, and Perimeter Protection

False bottoms and layered packing

The flat-ledge variant creates a raised platform, allowing you to pack accessories underneath and present the main product on top.

Angled product presentation

The angled-flap variant acts as a display ramp, tilting the product toward the user when the master carton is opened.

Perimeter crush reinforcement

The U-channel walls add a second layer of corrugated board to the front, back, and sides of the master carton, increasing vertical crush resistance.

Top-void filling for irregular items

When packed upside down, the insert can fill empty space above a short, heavy product, preventing it from shifting during transit.

Unboxing, Kitting, and Retail Preparation

E-commerce unboxing

Brands use the raised platform and thumb cut to create a clean, layered reveal for premium goods.

Industrial kitting

Parts distributors use the insert to separate heavy metal components from manuals or delicate cables in the same shipper.

Retail ready packs

The angled variant helps position products for immediate display when the outer shipper is opened.

When to Compare Trays or Partitions

When the insert must hold its shape outside the box

If the insert needs to hold its shape outside of a master carton, compare a roll-end tray with locking tabs. This U-channel insert will unfold if not constrained.

When packing multiple identical items

If you are packing multiple identical items like bottles or jars, a slotted partition or divider is more efficient than a U-channel liner.

Master Carton Fit and Assembly Labor

Master carton tolerances

The insert's outer dimensions must precisely match the master carton's internal dimensions. If the fit is too loose, the insert will splay; if too tight, it will bind and crush during loading.

Assembly labor and packing speed

These inserts are erected manually. The packing station must be set up for operators to fold the walls and slide the insert into the box in one fluid motion.

Board grade matching

The insert's board thickness affects the fold clearances. If you change from a thin E-flute to a thicker B-flute, the template must be adjusted to prevent the corners from binding.

Internal branding and print surfaces

Because the insert is often the first thing seen upon opening, decide whether the visible top flap and inner walls should be printed to support the unboxing experience.

Thumb Cut and Wall Adjustments

Thumb cut sizing

The extraction cutout can be widened for gloved hands or removed entirely if the end-user does not need to lift the insert.

Independent wall heights

The front and back walls can be adjusted independently to accommodate different product depths or master carton sizes.

Flap angle for presentation

The top flap can be set to fold at a flat 90-degree angle for a false bottom, or an angled 47-degree pitch to tilt products toward the user.

Packing details

Flatbed die-cutting for thumb cuts and chamfers

Because of the thumb cut and angled corner chamfers, this insert requires flatbed die-cutting and cannot be produced on a simple rotary slotter.

Flat delivery and warehouse density

The inserts ship completely flat, maximizing pallet density and minimizing warehouse space before use.

Flat Ledge Versus Angled Flap

Flat Top Ledge (EVC71003)

The standard template features a top ledge that folds at a 90-degree angle, creating a flat false bottom or separator.

Angled Presentation Flap (EVC71003a)

This variant replaces the flat ledge with a flap that folds at a 47-degree angle, useful for tilting products toward the user or filling irregular voids.

Additional notes

Master carton dependency for folded shape

This insert has no locking tabs. It will immediately unfold if removed from the master carton, so it cannot be used as a standalone tray to carry products around a facility.

Corner chamfers and fold clearance

The template includes specific angled cuts (chamfers) at the corners. These ensure the side walls clear the base when folded, preventing the corrugated board from binding or tearing.

FAQs

Do these inserts need to be glued or taped?

These inserts fold along pre-scored lines and rely entirely on the walls of the master carton to keep them folded. No adhesive is needed.

Can this insert be erected on automated packing lines?

This style is designed for manual assembly. An operator folds the walls and slides it into the master carton. It lacks the glue seams required for standard folder-gluers.

Why is there a cutout on the top flap?

The semi-circular cutout on the top flap gives the end-user an ergonomic grip to pull the insert out of the box, revealing any items packed underneath.

Can the insert be printed for unboxing experiences?

Because it is often the first thing a customer sees when opening the master carton, the insert can be printed with branding, instructions, or unboxing graphics.

How should the insert be sized relative to the outer box?

The insert's external dimensions must be sized to match the master carton's internal dimensions, minus a small tolerance for the board thickness to ensure it slides in without crushing.

Is double-wall board suitable for this insert?

Heavy double-wall board has strong fold memory and may be difficult to fold manually. A single-wall E-flute or B-flute is usually preferred for crisp folds and easy insertion.

Does the insert add stacking strength to the shipment?

Yes, the U-channel walls add a second layer of corrugated board to the perimeter of the master carton, which increases the overall vertical crush resistance.

How are these inserts delivered to the packing facility?

They are delivered completely flat, which maximizes pallet density and minimizes warehouse space before they are needed on the packing line.