Survival Credit Card Knife
I use these as my business card, and I’ll include one for free with every order we ship, as long as supplies last. However if you want to buy one as a standalone, you can do it.
These are an awesome fit between credit cards in your wallet, and fold open to a nice razor sharp knife. Note, these are sharp. These are prohibited as a carry-on by the TSA, so don’t try and get through screening with it in your wallet.