I'm a person of habit. If it works, I'll stick with it. I have bought this wallet about 4 times in 4 years. I have both black and brown. I think brown is great for going out as I use black for work. I work at an oil refinery and have multiple IDs and the dual panes help to display them. In addition to my IDs, I keep 6 cards in it (AAA, Costco, and four CCs). For cash, I recommend no more than 10 bills folded in half. Otherwise this thin wallet will become bulky and tight. As far as longevityβ¦