I used a money clip/card holder that was given to me for free at a business conference. Worked OK until I found a small, lightweight nylon wallet I used way back in my military days to carry my ID card since those things were too big to fit in a regular wallet. It's just a folding, two compartment wallet with clear plastic windows on the inside. I usually put my driver's license and debit card in one side, and some cash in the other. I never need anything else to carry with me while on a ride.