I hesitated for some time before getting a wallet made of anything but leather or faux leather. A couple of years ago, I purchased a Muradin wallet that was part aluminum, part leather. I liked the efficient, streamlined quality, but was unsatisfied by the bulk and ended up back-pocketing it on those occasions I didn't carry it in the outer pocket of my soft-side lunch box.
The Ekster wallet changed all that. I can carry the few cards I need, plus a tracker tile in the expansion, all in a form that's so slim I barely notice it in my front trouser pocket. Very satisfied!