Flowfold Vanguard. Made in the U.S.A. out of sailcloth. Weighs as much as three sheets of 8X11 paper. Made it's way into my pocket in 2015 and has been there ever since. I got another as backup and may not ever need it.
My only issue with older wallets is that sometimes the lining separates so that cards are more difficult to put back in. Which is why I end up getting a new one in the first place. Nothing more frustrating when you are trying to get out of a store and your card won't go back in it's slot in the wallet because the lining is pulling away from the leather.