I used to use a bi-fold wallet. Then I realized there were just a lot of extra layers of material for no real reason (probably more wallet than contents). So I switched to a no-fold type thing. It had slots for credit cards, a clear window for driver’s license, and also a metal clip on the side for cash. Then I realized that I don’t really need separate pockets for each card, I don’t need a clear window for my driver’s license (if I ever have to show it, I have to take it out anyway – I’m not handing over my whole wallet), and I don’t carry a lot of cash. So I just recently switched to a single clip. I have all of my cards, license/registration, and cash in one stack clipped together.
I’m still getting used to it but I like it.