"Single wall or double wall?" is the first question we ask when someone needs cartons, and the answer changes both the price and how well your goods survive the trip. Pick too weak and boxes crush at the bottom of the pallet. Pick too strong and you pay for strength you never use. Here's how to choose.
What's the difference?
Corrugated board is built in layers. The flat outer sheets are liners. The wavy layer between them is the flute, or medium.
- Single wall = liner + flute + liner. Three layers, one row of flutes.
- Double wall = liner + flute + liner + flute + liner. Five layers, two rows of flutes bonded together.
The second row of flutes makes double wall much stiffer. It resists crushing when stacked, protects better against punctures, and holds its shape under heavier contents.
The flutes we run
| Board | Approx. thickness | Strengths | Typical use |
|---|---|---|---|
| E flute (single wall) | ~2 mm | Thin, rigid, smooth print surface | Mailer boxes, retail and product boxes |
| B flute (single wall) | ~3 mm | Good crush resistance, prints well | General shipping cartons, die-cut boxes, inner cartons |
| A flute (single wall) | ~5 mm | Most cushioning of the single walls | Lighter goods that need extra protection |
| BE flute (double wall) | ~5 mm | Double-wall strength with a smooth, printable face | Heavier printed shipping cartons |
| BA flute (double wall) | ~8 mm | Highest stacking strength and protection | Heavy, industrial and export cartons |
When single wall is enough
- Contents are light to medium weight
- Cartons aren't stacked high, or the product itself carries the load (for example, rigid tins or bottles in a partitioned box)
- Short, direct deliveries around the Klang Valley
- E-commerce parcels, retail packaging and inner cartons
For most everyday shipping, B flute single wall is the workhorse: strong enough for the job, economical, and good to print on.
When to step up to double wall
- Heavy contents. Machine parts, hardware, tiles, liquids in bulk.
- Tall stacks. Pallets stacked high in a warehouse, or cartons at the bottom of a container load.
- Long or rough journeys. Export shipments, multiple handling points, interstate transport.
- Fragile or high-value goods, where a crushed carton costs far more than the box.
- Long storage in humid conditions. See below.
What about cost?
Double wall uses more paper and an extra fluted layer, so it costs more per box than single wall in the same size. But compare it with the cost of failure. If one collapsed carton means a damaged product, a reshipment and an unhappy customer, double wall often pays for itself. If your cartons are light and never stacked, single wall with the right paper grade is the smarter buy.
There's also a middle option: a heavier paper grade in single wall can close much of the gap for medium loads without going to double wall. Our guide to what affects carton box prices explains how board and paper choices feed into your quote.
A quick way to decide
- How heavy is one packed carton?
- How high will cartons be stacked, and for how long?
- Will they be stored somewhere humid?
- How far, and how roughly, will they travel?
- What does a damaged delivery cost you?
If the answers are "light, low, dry, short and cheap", single wall is right. If any answer is "heavy, high, humid, far or expensive", talk to us about double wall or a stronger grade.
Common questions
Can I print on double wall cartons?
Yes. BE flute gives double-wall strength with a smoother outer face that prints well. BA flute prints fine for simple logos and handling marks. See how custom printed cartons work.
Is double wall waterproof?
No. Double wall copes better with humidity than single wall, but neither is waterproof. Keep cartons off the floor and under cover, and stretch-wrap pallets to keep moisture and dust out.
Should I test before a big order?
Yes. For a new product or a new route, ask for samples and do a real packing and stacking trial before committing to a full run.
Not sure which board your product needs? Send us the product size, weight and how you store and ship it, and we'll recommend the board, usually within 2 hours. You can also browse our carton box range.