I threw the wallet out a good ten years back. I had always been a minimalist, and for a long time had a silky black ripstop number that added practically nothing in terms of thickness, but then that wore out and I could not find a suitable alternative.

Eventually I realized that I could get away with one credit card / debit card, my ID a few business cards and a luck $2 bill folded small between the lot. I fold my large bills around this, and hold everything together with a large stainless steel butterfly clip. Butterfly clips are great, they last for ever, look good, are easy to slip over my bills and add practically no thickness to my minimal bill fold. One added advantage is that when I go to Europe my wallet system still works (Euro bills are way larger than US bills). Small bills and change sit in my front pocket.