18 x 18 x 18 in corrugated boxes

What fits in a 18 x 18 x 18 box

Pillows and comforters, assembled lampshades, insulated shipping liners, plastic housings, cushioned electronics with foam end caps. Warehouses also keep 18 inch cubes as the "large" box on a packing bench, the one that takes whatever the medium box will not.

Large panels flex. On an 18 inch box the walls are long enough that a soft product can bulge them, and a bulged box stacks badly. Fill it, or choose a wall that holds its shape.

The board it needs

For light bulky goods, 32 ECT single wall. For loads near the single wall rating of 65 lb, double wall at 48 ECT (275# test), rated to 100 lb, is the usual move at this size, because the longer panels give single wall less stacking support for the same weight. C flute single wall or BC flute double wall are the common builds.

Packing notes

Eighteen inch cubes are a moving-company staple for kitchen goods, lampshades, and medium household items, and online sellers use them for bulky but light products. A packed 18 inch box of books would be far too heavy to lift safely, so the size is better kept for lighter loads. Large panels flex, so tape both seams fully and run tape over the corners. Office movers use them for files and monitors; pet suppliers send beds and large bags of litter.

Sizes close to this one

A shallower 18 x 18 x 12 or a longer 20 x 14 x 14 sometimes suits the product better. For moving dishes, a cell kit inside an 18 inch cube is a common pairing. Lampshade makers sometimes prefer 18 x 18 x 16. If you are unsure, list both sizes on one request and compare the prices.

On a 48 x 40 pallet

Two across each side, four per layer, at 18 1/4 in outside. The load sits about 11 1/2 in short of the 48 in edge and 3 1/2 in short of the 40 in edge, so these loads are usually stretch-wrapped with corner boards to keep the column square.

Worked from an outside size of the inside dimension plus 0.25 in on length and width, a working allowance for single wall; double wall adds a little more. Ask us to confirm before you plan a load.