Glossary
Single-wall cardboard
Definition
Corrugated board made from one fluted layer sandwiched between two flat liners. It is the everyday choice for lightweight postal boxes and cartons.
Also known as: Single wall board, Single-wall corrugated
Single-wall cardboard has a three-layer construction: an outer liner, an inner liner and a single wavy fluted medium in between. That flute is what gives corrugated board its strength-to-weight advantage over solid card, providing cushioning and rigidity while staying light.
It suits the large majority of postal and retail packaging, including mailer boxes, product cartons and lighter shipping boxes. Different flute profiles change the finish and protection: fine flutes such as E and B give a smoother print surface for retail boxes, while C flute offers more cushioning for general shipping.
For heavier or more fragile goods, or for stacking on pallets, double-wall board is usually a better fit. As a rule of thumb, single-wall handles everyday parcels up to moderate weights, and you step up to double-wall when contents are heavy, dense or need to survive a long supply chain.
What to check
- Match flute type to the job: E or B for print, C for general cushioning.
- Confirm the board weight or ECT rating suits your product weight.
- For heavy or stacked loads, compare against double-wall board.
- Check the box is rated for your typical parcel weight, not just its size.
- Ask whether the board is recyclable kerbside in your customers' areas.
Need help choosing the right spec?
Tell us what you're packing and your quantities — we'll recommend the right size, grade or material and price it for your order.
Single-wall cardboard — FAQs
When should I use single-wall instead of double-wall cardboard?
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