I quit carrying a wallet after many trips to Europe and noticing how one could always spot an American by the wallet bulge in a back pocket. Mostly tourists or business travelers there for a short time, they immediately became targets for the nearest and plentiful pickpockets who work touristy areas.
I changed to left front pocket, only credit cards with cash folded over them, wrapped with a couple rubber bands. The rubber bands make it more difficult to for a pickpocket to slide the bundle out without the victim noticing. The "wallet" is nice and flat, and easy to use once you get used to it. I haven't traveled overseas in years, but still keep the money there, and EDC 3:30-4 o'clock right side.
An added bonus - the paperboy brings me a new "wallet" every day.