Single-wall or double-wall? How to read the quality of a shipping box
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by Verpakkingdeals.nl
5 min reading time
Single-wall, double-wall, E-flute or C-flute: what do these terms mean on a box product page and what quality do you need? A practical explanation with guidelines and choices per package type.
Two webshops send the same product. One box arrives with a dented corner but an intact product, the other is sagged in the middle and the contents are loose. The difference is rarely in the tape or the delivery person. It's in the cardboard: how many flutes it contains and how coarse those flutes are.
On product pages for boxes, you'll find terms like single wall, double wall, E-flute, and BC-flute. Handy if you know what they mean, confusing if you only compare on price. Below, you can read what's behind these terms and what quality suits what you're shipping.
What corrugated cardboard actually is
Corrugated cardboard consists of flat paper layers with a corrugated layer in between. This flute is the construction: it keeps the outer layers apart, absorbs impacts, and gives the box rigidity. The coarser the flute, the more air and thus the more shock absorption. The finer the flute, the smoother and sturdier the surface—convenient if the box needs to be printed on.
Single wall has one corrugated layer between two flat layers. Double wall has two, with an extra flat layer in between. Double wall is thicker, heavier, and more expensive, but it withstands much more weight and stacking pressure.
The types of flutes at a glance
The letters refer to the coarseness of the flute. The thicknesses below are indicative values: they vary by manufacturer, so always check the specifications for the box you order.
Flute
Type
Thickness (approximate)
Typical use
E-flute
Single wall
approx. 1 to 1.5 mm
Thin, printed packaging and letterbox boxes
B-flute
Single wall
approx. 3 mm
Standard shipping boxes, inner packaging
C-flute
Single wall
approx. 4 mm
Most common size for regular parcels
EB-flute
Double wall
approx. 4.5 to 5 mm
Strong and smooth enough for printing
BC-flute
Double wall
approx. 7 mm
Heavier shipments and boxes that will be stacked
What you take away from this: E-flute is thin and neat, C-flute is the workhorse size, BC-flute is for weight and stacking. Everything in between is a compromise between price, weight, and protection.
When to switch to double wall?
Three signals point towards double wall. Firstly, weight: the heavier the contents, the sooner the bottom will give way, especially if the box is grabbed from the bottom when lifted. Secondly, stacking pressure: if your box goes into the bottom of a roll container or pallet, it will bear the weight of everything above it. Thirdly, dimensions: a large box with the same cardboard quality as a small one will sag sooner, simply because the surfaces are larger.
If you ship light, compact items—clothing, cosmetics, accessories—double wall is usually overkill. You'll be paying for cardboard you don't need, and heavier cardboard also counts towards shipping weight.
If it's about volume, you'll need the larger sizes. The moving box of 480 x 430 x 330 mm with a 50-liter capacity costs €3.50 and is intended for stacking full. For this size, pay particular attention to what you put in it: 50 liters of books is a very different story than 50 liters of pillows.
The box is only half the story
Even the heaviest quality cardboard will break if the sides tear open. A good closure is just as important. For volume shippers, the tape rolls of 48 x 66 mm in a set of 6 for €21.00 are a logical basis; 48 mm wide tape covers a normal box seam in one pass. For opening incoming deliveries without damaging your own stock, a set of 8 utility knives for €4.95 works perfectly.
Measure your heaviest product, not your average. That's what you base the cardboard quality on.
Check if your boxes will be transported or stored stacked. If so, choose a more generous quality.
Compare internal dimensions, not external ones — with double wall, that can quickly make a difference of one and a half centimeters in each direction.
Calculate the price per package, including tape and void fill, not just the price per box.
Order a small quantity first and ship ten with it before committing to a pallet.
In short: let the contents determine what cardboard you buy, not the other way around. View the full range in Packaging & Shipping, browse the boxes, the letterbox packaging, and the tape, or check out the value packs for webshops if you're buying in larger quantities. Unsure which size or quality suits your product? Email your dimensions and weight to info@verpakkingdeals.nl and we'll help you find the best solution.
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