We at J&H keep most things pretty traditional, and accordingly carry their bi-fold. The bi-fold wallet design folds over once to fit into a pocket (in our case our back jeans pocket). The slim, fits perfectly and contains spots for two credit cards, and a clear sleeve for an ID. The back pockets can be used for cash, or more cards. In our experience the buffalo hide is incredibly durable and only looks better after it has been used for a few years. We carry the slim wallets in Peanut, Brown and Black, and the interior of all three is a light brown cowhide. Despite American Bison topping the scales at over 1,400 pounds the hides used for these wallets are often smaller than cow hides; due to the difficulty of stretching the hides. The benefit, is the gorgeous texture you see on these bison wallets.