This was a neat design I came up with to hold bottles. Folds flat to ~1.35” thick. The handle piece moves sideways while the outsides move in and the bottom folds up inside them.

The whole thing is made out of 100% wood and glue. 3mm baltic ply and toothpicks to be exact. The hinges are kind of a pain to assemble because there are lots of small pieces and make it a bit tedious.

I was originally trying to turn it into a product, but the assembly time required made it not feasible. Still an option to release as a kit option.