How to make a tetrapack wallet:
- cut the top and bottom, make a flap on one side,
- fold in half,
- tape the middle edges, and
- stick a bit of velcro to close the flap, or use an elastic band
For better instructions, Please click here to go to Espirit Cabane-
Also, check out this well-designed website – it has a beautiful gallery of these folded tetra-pack wallets for sale, and a cool flash animation of the folding process:
http://www.berlingot.ch/ (it’s in French I think, but still worth checking out!)