Origami-inspired and deceptively durable, the Paperwallet is eco-friendly too. The ingenious design keeps it ultra slim line, expanding only as you add cash and cards inside. The “green” material from which it is made is Tyvek, which has been cut, folded and glued with no seams nor stitches. It’s so tough you can even fill it with water. But don’t do that, just take our word for it.