ISAMU KATAYAMA BACKLASH Double Shoulder Leather Wallet (Bi-fold) While short wallets like bi-folds and tri-folds are trending nowadays, this bi-fold wallet has an overwhelming presence due to its extremely thick leather. There are signs of aging, scratches from use, and unique deformations characteristic of the brand, so how about it for those who don't mind these aspects or those who want to try it out?