This is a derivative of the Folding Wood Booklet, a great implementation of living hinges in wood.
I redrew the design and made it into a box, suitable for trinkets, cards, photos, small papers.
The hinge is quite durable, but not ineducable. I don't feel like I would wear it out with frequent use. It's also surprisingly flexible for being made of wood.
I plan on using more living hinges in wood from now on.
Cut from 3mm wood of your choosing, glue the walls and add a elastic string to hold it shut.