Having a bunch of keys in one pocket and your wallet in the other is actually very space consuming. A wallet itself without anything in it can be quite thick and usually needs a pocket to itself.
Keylet hopes to solve this problem by having an essential set of keys, your cash and cards in a neat little device. It's made from stainless steel and is a lot thinner than your ordinary wallet. Also the design has been made to be as minimalistic as possible but obviously not compromise on quality.