Packing · 2026-08-12 · 2 min read
Flutes up, always: why a box on its side buckles
Corrugated board is strong in one direction and weak in the other. Getting the orientation right is the difference between a stack that holds and a box that gives way.
The board only works one way
A corrugated box is three layers: two flat liners with a fluted sheet glued between them. That fluted sheet — the row of arches you see if you look at a cut edge — is what carries weight. But it only carries it edge-on, along the flutes. Stand a box the right way up and the flutes run vertically, like a row of tiny columns, and the box will happily bear the load of the ones stacked on top.
A box laid on its side
Turn that same box on its side and the flutes now run horizontally. The columns are gone. The board bends instead of bearing, the liner wrinkles, and the box buckles well below the load it would have shrugged off standing up.
It’s a threshold, not a slope
Buckling isn’t gradual. A sideways box holds — until a critical load, and then it goes. That’s why you can’t tell a badly-packed van is badly packed by looking at the top of the load. The failure is at the bottom, under everything else, and it happens all at once.
Every box goes in flutes up. Heavy on the deck, fragile on top, double-wall where the load is highest. The order is the load plan, and it’s written before the van is booked.
Double-wall earns its place
For china and glass we use double-wall cartons — two fluted layers instead of one. Under the same load a double wall crushes barely a fifth as far as a single wall, which is what keeps the box beneath it intact.
Get a load plan and a fixed price
Tell us the property and the date. We survey it, write the load plan, and send one fixed price.