Spy Coins
This might be a little more than walking around money. We won't ask what you'll do with them, but these real pieces of US and EU currency can hide SD cards, guide you out of the woods, and cut, well, lots of things. Not to mention the bolt that's hollow and the tiny bracelet that can break glass. Call it Everyday Carry if you'd like, but this may be more Espionage, Deceit, and Coercion.