We've talked about duct tape wallets in the past because they're free and, despite being hideously ugly, pretty awesome. On the flip side, a wallet made out of a coffee bag (for ground coffee -- not the teabag-like ones) fits in the same DIY happy place, while actually looking nicer than something you might find sold in stores. Oh, and it smells really nice.
Most wouldn't think it, but once you remove the plastic valve from a coffee bag and cut it open, you've got a pretty decent amount of high-quality, durable, and quite attractive material that can be used for just about anything. If you've got a sewing machine (or know somebody who does), you can make a wallet so sturdy that it'll last for years. If not, a minimal amount of duct tape can work, too.
Since the material is basically a thick foil, it won't wear easily, and there's also a decent chance that one of these could block RFID signals pretty well. If you happen to test that theory out, let us know in the comments!
Hit the link below for the full step-by-step at Instructables.