Cash seems to be getting old. People are moving on, want to make things simpler and carry less stuff with them. Payments from your phones are becoming easier than ever and cards have now become standard way of having all your money with you without having a bulging pocket.
Supr Slim is a super minimal and thin wallet which simply carries your cards. It's made from high quality materials which enable it to stretch and fit a bunch of cards but then return to its normal thin state.
It's a Kickstarter project which goal was to reach $10k, it's doing 11x that, now at $115k - with 18 days still to go. It comes in an array of colours and is perfect for the minimalists out there. I'm very tempted to get one myself.