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ECMA F10.11.00.00

Double-Compartment Open Sleeve

Available in a wide range of custom configurations & material selection.
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Product details

Top highlights

Open top and bottom with an integrated central divider
Delivered flat and opens for hand packing
Relies on shrink wrap, friction, or an outer box for product retention

About this product

The double-compartment open sleeve is a figure-8 folding carton designed to bundle two products together or separate them inside a larger box. Delivered knocked down flat, it opens into a twin sleeve in one motion, which can simplify manual packing.

Because it has no top or bottom flaps, this sleeve relies on friction, shrink wrap, or an outer master carton to retain the products. It is often used for retail twin packs, promotional bottle bundles, or acting as an internal partition for fragile items.

Common uses

Retail twin packs
Promotional bundling
Internal partitions for fragile goods

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Size and quantity

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Retail Bundling And Internal Separation

Retail twin packs and promotional bundles

The continuous outer panels provide a large uninterrupted billboard for retail graphics, while the central divider provides a physical barrier between two primary containers like bottles, jars, or cosmetic tubes. It is frequently used for paired product sets or limited-time promotions.

Internal separation for master shippers

When packing multiple fragile items into a larger corrugated box, this sleeve acts as a fast-erecting partition. It drops over two items to provide separation during transit, often requiring less assembly time than traditional corrugated dividers.

Sample and trial product pairing

Brands introducing a new product alongside an established seller often use this sleeve to pair a full-size item with a smaller sample. The divider helps orient both items for the retail shelf.

Component and accessory bundling

For hardware or electronics, the sleeve can group a main component with its associated accessories. This groups the parts together inside the main product box without needing a fully enclosed inner carton.

Retail Promotions And Master Shipper Packing

Beverage and cosmetics promotions

These sectors often need to pair two distinct items temporarily. The open sleeve allows the primary packaging to remain visible at the top and bottom while banding them together for the shelf.

High-volume manual kitting

Because the sleeve is pre-glued by the converter and delivered flat, packing staff only need to push the edges to open it. This one-handed motion can reduce the need to fold and lock a traditional partition or tray.

E-commerce fulfillment prep

Fulfillment centers use these sleeves to pre-bundle items that are frequently bought together. The sleeve holds the pair together in the warehouse bin before they are packed into a final shipping box.

When To Consider Closed Twin Packs

When products need base support

If the items are heavy, slippery, or will be handled individually without shrink wrap, an open sleeve may allow them to slide out. Compare this to a closed-bottom twin pack, which adds base flaps to hold the items from below.

When shipping directly via parcel networks

This sleeve provides no top or bottom coverage for parcel transit. It should be placed inside a closed outer box if it is leaving the retail pallet.

Board, Fit, And Retention Choices

Product retention strategy

Decide how the products will stay in the sleeve. Tight dimensional tolerances can create a friction fit for compressible items, but rigid items like glass bottles often use an overwrap or a tight master carton to keep them in place.

Board thickness and the central divider

The internal divider panel is slightly shorter than the outer width to account for the thickness of the folded board. If you change the board caliper, the template should be updated so the divider does not bow or interfere with the sleeve folding flat.

Grain direction

The material grain should run parallel to the height of the sleeve. This can help reduce bowing on the large outer panels and support clean folding during high-speed gluing.

Print surface and coating

The large flat outer panels provide excellent billboard space. However, if the sleeves will rub against each other during transit to the store, consider a protective varnish or coating to reduce ink scuffing.

Compartment And Divider Adjustments

Compartment sizing

The template assumes two equal compartments by default, but the internal divider can be offset if you are bundling two products of different sizes.

Divider height adjustments

The central divider does not have to match the full height of the outer walls. It can be shortened if you only need separation at the base or neck of the products.

Cutouts for product visibility

Die-cut windows or shaped edge profiles can be added to the outer panels to reveal specific labels, barcodes, or product features on the primary containers.

Board and packing details

Pallet density and flat delivery

Because of the internal divider, the glued flat blank is three layers thick at the seam. This slightly reduces the number of sleeves that fit in a shipping case compared to a single-compartment sleeve, which should be factored into high-volume storage planning.

FAQs

Product fit and retention

Will my products fall out of the bottom?

Because the sleeve has no base flaps, products can slide out if the sleeve is lifted without support. It relies on friction, an external shrink wrap, or being packed tightly inside a master carton.

Can the two compartments be different sizes?

While the default template creates two equal halves, the internal divider can be adjusted to accommodate a larger primary product paired with a smaller sample or accessory.

Route and shipping

Can this be used as a shipping box?

The open ends provide no coverage against dust or impact during transit. It is a retail presentation band or an internal separator for a larger shipping box.

Materials and finish

What materials are common for this sleeve?

Folding boxboard is typical for retail promotions, offering a good balance of stiffness and print quality. If you are bundling heavy glass bottles, a micro-flute corrugated board may be compared to help manage wall bowing.

Packing labor

How is the sleeve assembled?

The converter glues the internal divider and the outer seam, delivering the sleeve knocked down flat. The packer pushes the opposite edges, and the sleeve opens into its final figure-8 shape.

Production path

Does the internal divider involve special manufacturing?

The converter uses a folder-gluer capable of executing the internal fold for the divider before sealing the outer tube. This involves specific machine setup, so the exact board thickness should be known before production.

Delivery and storage

How are these delivered to the packing facility?

They are delivered glued and knocked down flat. Because the internal divider adds a third layer of board to the folded blank, they take up slightly more pallet space than a single-compartment sleeve.

Customization

Can the central divider be shorter than the outer walls?

The divider height can be adjusted independently of the outer sleeve height. This is often done to reduce material use or to allow the tops of the products to touch while keeping the bases separated.