LimIvanAshland 's Fat Herbie. I bought one and won't ever look back. It's not ridiculously long, still fits in all my back pockets, but you could probably put 20+ cards in the card slots (I only carry 5 but I just put them all in one and they fit fine) and the outer pocket is massive. I've held probably 50 bills plus other papers in the pocket. http://www.ashlandleather.com/Ashland-Fat-Herbie-Wallet-Horween-Chromexcel-p/fatherbiecxl.htm
If you wanted something like a checkbook sized wallet, I have no idea.