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FEFCO 0921

S-Shaped 2-Cell Divider

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

Creates two separated cells inside a master box
Adds partial reinforcement along selected side walls
Requires manual two-handed insertion

About this product

This S-shaped corrugated liner creates two compartments with a central divider and partial side-wall reinforcement. It does not wrap or double the full interior perimeter.

Because it uses straight parallel creases, it can often be manufactured on straight-line equipment. The accordion-style folds require manual assembly, making it a strong choice for heavy industrial kitting but challenging for high-speed automated packing lines.

Common uses

Heavy machinery parts
Glass bottles
Industrial kitting
Heavy retail packs

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Size and quantity

Detailed dimensions

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Total length inside the box

Total width inside the box

Divider height

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Materials and print

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Print and artwork

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Custom changes or unusual needs

Do the two compartments need to be the same size?

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Heavy-duty separation and wall reinforcement

Heavy industrial kitting

Separating two dense metal components. The central wall prevents product-to-product collision, while the doubled outer perimeter prevents the heavy parts from blowing out the sides of the master box.

Fragile twin-packs

Glass bottles or ceramics needing a double-wall buffer. The S-weave provides alternating shock isolation that a simple slotted partition cannot match.

Palletized warehouse storage

Boosting the Box Compression Test (BCT) of the outer shipper. The seven vertical panels act as load-bearing pillars, distributing top weight down to the base.

E-commerce liquid transport

Isolating two heavy liquid containers. The continuous corrugated sheet prevents hard contact during transit while reinforcing the outer box against crushing.

Industrial kitting and fragile twin-packs

Industrial parts distribution

Buyers shipping heavy components need high crush resistance. This insert adds that strength without requiring a completely new, heavier master box.

Beverage and liquid transport

Operations packing twin bottles need shock isolation. The continuous corrugated sheet prevents glass-on-glass contact during transit.

Automotive aftermarket kitting

Packing heavy paired components like brake rotors or suspension parts. The divider keeps heavy metal items separated while reinforcing the outer walls against shifting.

When to consider a different partition style

High-speed fulfillment

Board spring-back makes this insert hard to automate. Operators must hold the tensioned S-shape while plunging it into the box. If packing speed is the priority, look at pre-assembled interlocking partitions.

Single-item protection

If you only need to reinforce the outer walls and do not need a central dividing wall, a simple 4-panel perimeter sleeve (0904) uses less board and is easier to insert.

Close variants and lookalike dielines

The closest library neighbors include 0920, 0908, 0909. 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, flute, and assembly choices

Board thickness and folding fatigue

Heavy double-wall board provides substantial shock absorption but increases manual folding fatigue. Operators will have to fight the board's natural spring-back during assembly.

Flute direction

The flutes must run vertically. If the flutes run horizontally, the liner loses its primary function as a vertical stacking column.

Packing line setup

This is a two-handed packing job. The insert has no native locks or glue joints. It relies entirely on the physical boundary constraints of the outer package to hold its shape.

Total flat length

To wrap the perimeter of two cells, the unfolded flat sheet is very long. For large master boxes, this total length can exceed the feed limits of smaller converting machinery.

Modifying the standard S-fold

Asymmetrical cell dimensions

The two compartments do not have to be identical. The central dividing wall can be shifted to accommodate one large item and one small item.

Corner chamfers

Adding angled cuts to the corners can prevent the insert from binding against the inside of the master box during insertion. This modification requires a different production method.

Product-specific cutouts

Adding recesses to the central dividing wall to cradle specific shapes. Like corner chamfers, this moves the design away from simple straight-line production.

Board and packing details

Straight-line production versus custom cutting

A standard S-shaped divider is just a rectangular sheet with six parallel creases. It can run on a basic slitter-scorer, completely bypassing flatbed cutting. Adding cutouts, locking tabs, or corner chamfers immediately forces the job onto a flatbed press, changing the production path.

Design variants

Multi-cell expansion

The alternating accordion pattern can theoretically scale to three or more cells by adding more panels, though this dramatically increases the total flat length of the board.

Additional notes

Blank sprawl and machine limits

To wrap the perimeter of two cells, the unfolded flat sheet is very long. For large master boxes, this total length can exceed the feed limits of smaller converting machinery.

FAQs

Quantity or production path

Does this insert require custom flatbed cutting?

Usually no. If you keep the edges straight and only use parallel creases, the factory can run this on a standard slitter-scorer.

Packing labor

Can this be inserted by automated machinery?

No. The board's natural spring-back across six unbonded creases requires manual, two-handed handling. Operators must hold the accordion shape under tension while plunging it into the master box.

Product fit or inserts

How does the divider stay closed?

It relies entirely on a friction fit inside the master box. There is no tape, glue, or locking tab holding the S-shape together.

Board and finish behavior

Does it matter which way the flutes run?

Yes. The flutes must run vertically. This allows the seven panels to act as vertical pillars, distributing top loads evenly to the base.

Print or label surface

Can we add cutouts for specific product shapes?

Yes, but any deviation from a straight rectangular silhouette forces the job onto a flatbed or rotary press, which changes the production path.

Related-package choice

What makes this different from a standard slotted partition?

A standard slotted partition only divides the center of the box. This S-shaped liner divides the center and wraps the entire inner perimeter, doubling the thickness of the outer walls.

Route and shipping

Will this insert prevent the outer box from crushing?

It increases the vertical stacking strength of the outer box by adding a second layer of corrugated board around the perimeter, making it useful for heavy pallet loads.

Samples and prototypes

Is it easy to test a prototype of this divider?

Yes. Because the standard design relies entirely on straight parallel creases without complex interlocking tabs, a sample maker can quickly cut and score a prototype to test the friction fit inside your master box.