Robinnaiitor

Hi all, I'm running PS 1.7, and I'm having some trouble with product sizes and weights. The thing is: I sell pieces of vinyl, which in terms of size for packaging does not increase linear. When people order multiple meters of it, I can simply roll it up into a tube and it will not occupy much space. One meter of this product can be contained in about an area of 30 cm x 4 cm x 4 cm, but 2 meters does not occupy 60 cm x 8 cm x 8 cm, it occupies 30 cm x 4,01 cm x 4,01 cm.. I have thought about it before, and first came up with setting the width and height to a very small number (of which I know will always fit into the shipping container). But then a different problem occurs: 2 different colors of this product are not rolled up together, they will be 2 separate rolls of vinyl. A solution might be sizes per stack, so 1-10 meters would take up x space, and 10-20 meters would take up z space. But I have yet to find a way (or module) to do so.