Need to prepare a knife in your wallet for some emergency situations? Take a look at CardSharp 2 credit card pocket knife, it may be able to meet your requirements.
CardSharp 2 is a practical, portable pocket knife that measures 85.6 x 54 x 2.2mm and weights 13g. As we can see from the images, the utility knife features ultra slim and foldable design, when not in use the knife is folded as a credit card so you can put it into your wallet, and a locking mechanism protects you from the blade and a protective sheath protects the blade from you. When needed the extra long stainless steel surgical blade offers long-lasting, rust-free sharpness for various purposes, apart from that, the polypropylene body provides nice grip.
CardSharp 2 credit card pocket knife is priced at $17.99 USD. If you’re interested, jump to ThinkGeek for more details.