I have metric and imperial hex wrench sets that each came in a plastic bag-style case. These bags have gotten so old that they have started to disintegrate. I’ve printed new plastic trays with lids that hold each set. Finding the correct slot widths, depths, and radii required a lot of trial and error and many prototypes. These are available on onshape.com for anyone who might like to use/modify them for their own purposes.
