Choosing board thickness for a rigid box

A rigid box is two structures in one: a greyboard wall that holds the shape, and a paper wrap that carries the print and surface finish. Buyers usually start with the look, but the choice of board thickness constrains what the wrapping step can do without showing edges or bubbling the paper.

As a starting point, boxes up to about 200 mm on the long side work with 800 to 1000 gsm board. Between 200 and 350 mm, 1200 gsm is the usual choice, and larger presentation boxes go to 1500 or 1600 gsm so the lid does not flex when lifted one-handed.

The wrap matters as much as the board. A 157 gsm specialty paper bends around a corner more easily than a 200 gsm textured sheet, and heavy textures tend to lift at the corner radius. If the design calls for a coarse texture, we either increase the corner radius or add a small gap between the lid and base so the edges are not asked to do too much.

Weight in the box also changes the fit. A box holding several glass bottles needs a tighter lid and an insert that takes the load off the wrap. A lighter set can run a looser lid, which is easier to open and cheaper to produce.

For export orders, the last consideration is climate. Paper moves with humidity, and a box packed in a dry inland plant and opened in a coastal market can tighten or loosen by a millimetre or so. Build a small clearance into the lid fit and keep the packed cartons sealed until they reach the destination.

None of this replaces a sample. The measurements above are a starting point for the sample request: send the packed product dimensions and weight, and the dummy will show whether the board and wrap you chose behave as intended.

Written by our prepress and production team from the equipment and processes we run. Materials and structures behave differently, so the approved sample governs.