double wall packaging

double wall packaging is corrugated packaging built from board with two fluted layers and three liner sheets, giving far greater crush resistance and stacking strength than single wall board. Custom Postal Boxes, a project of Vertex Packaging based in Wolverhampton, manufactures custom printed postal, mailer and shipping boxes in house for UK businesses, including double wall formats for heavier and higher value goods, with low minimum order quantities and free UK delivery.

How double wall packaging is built

Corrugated board gets its strength from fluting, the wavy paper layer bonded between flat liners. Single wall board has one fluted layer, while double wall board bonds two fluted layers with a liner between them and a liner on each outer face. The two flutes can be different profiles, combining a larger flute that cushions well with a finer flute that prints and resists puncture, so the board works hard in both directions.

That structure resists edge crush, which is the force applied when boxes are stacked in a warehouse, a van or a sorting centre. It also resists puncture from corners of neighbouring parcels and keeps its shape when contents are dense, such as books, tools, ceramics, glassware, electronics and multi item orders. For many businesses, stepping up to double wall is cheaper than replacing damaged goods and handling the returns that follow.

When single wall board is still enough

Light, robust goods such as clothing, soft furnishings and flat documents usually travel well in single wall board, which keeps packaging weight and cost down. The decision should follow the product, the journey and the stacking the parcel will face. If items are light but the box will sit at the bottom of a pallet or a courier cage, double wall can still be the safer choice.

Weight guidance for double wall boxes

As a broad guide, well made double wall boxes are widely used for loads up to around 20 kg to 30 kg, but safe capacity depends on box size, board grade, how evenly weight is spread and how the base is sealed. Smaller boxes carry more relative to their size than large ones, so always test a packed sample under realistic stacking before a full order.

Choosing double wall packaging for your products

Start with the heaviest typical order, not the average one, and choose a box close to the contents size so dense goods cannot shift and gather momentum. Our double wall shipping boxes and heavy duty shipping boxes are built for this work, while the wider corrugated shipping boxes range covers lighter duties for comparison. Tape the base with a full overlap and consider strapping for palletised loads.

Double wall board still prints well, especially with kraft or white outer liners, so strength does not mean giving up branding. A printed warning such as this way up or fragile, placed consistently, helps handlers and looks professional. Keep print clear of tape lines and label areas, and remember that a slightly thicker board raises parcel weight a little, which is worth checking against your courier weight bands.

Packing heavy goods well

Place the heaviest items at the base, wrap fragile pieces individually, and fill voids with paper or board so nothing can move. Corners deserve extra attention because drops usually land there first, and a small amount of edge protection can save an expensive product. Seal, shake and lift the packed box by its base to test your method before the courier collects it.

Responsibility, recycling and ordering

Corrugated cardboard is widely recyclable in the UK once tape and plastic fillers are removed, and using the right strength first time avoids the extra packaging that damage and resending create. Larger businesses that supply packaging may also have reporting or recycling duties, which the GOV.UK guidance on packaging producer responsibilities explains. Choosing double wall only where the load justifies it keeps material use honest and costs under control.

Custom Postal Boxes works on a quote basis, with pricing dependent on size, material and quantity, and free design support if you want print. Tell us the weight and size of your goods and how they travel, through our contact page for a quote, and we will recommend a board grade rather than simply the thickest option. For lighter duties, compare our single wall corrugated boxes so each product line gets the protection it actually needs.

FAQs about double wall packaging

What does double wall mean in packaging?

It means the corrugated board has two fluted layers bonded between three liner sheets, instead of the single fluted layer in single wall board. The extra layer adds crush resistance, puncture resistance and stacking strength for heavier or more fragile goods.

How much weight can double wall packaging hold?

Well made double wall boxes are commonly used for loads up to around 20 kg to 30 kg, but the safe limit depends on box size, board grade and how weight is distributed. Test a packed sample under stacking conditions before relying on any figure.

Is double wall packaging recyclable?

Yes, corrugated double wall board is widely recyclable once tape, plastic fillers and labels are removed as far as practical. Flatten boxes before recycling so they take up less space in collection vehicles and recycling streams.

When should I choose double wall over single wall?

Choose double wall for heavy, dense, fragile or high value goods, for boxes that will be stacked, and for longer or rougher journeys. Light and robust products usually travel safely in single wall board, which keeps weight and material use lower.