It’s made out of Tyvek, a stubborn material. It won’t rip so easily or even burn so easily. And now, it’s in the origami-like form of a wallet for $15. It’s capable of holding some credit cards, business cards, and cash. And in this case, the design is all about Pi, or 3.1415926535 (and continuing, of course) for you geeks and math nerds. So it is pretty awesome. And since it is made out of the same material of FedEx shipping packs, and is even stronger, it makes for a formidable and somewhat discreet wallet. It measures 3 3/8 inches wide by 10 inches long, open.
And best of all — it works and is now my primary wallet. Available at ThinkGeek. Score: 9/10