this wallet should easily hold tons of cash, 4 easily accessible credit cards, and 2-4 more locked credit cards
the outside (edge) credit card slot has a flap you tucked in. unfold this flap, put cards in, refold flap, and they should be locked in, you can now put another card in this pocket.
this wallet is very durable due to its construction, but feel free to use tyveck or other materials if you have them.
any questions/improvements/praises PLEASE COMMENT
it should be noted that in the real world i use something like johnsuri's 'anti-wallet'. his idea deserves more credit. i've added an extra clip and some paracord so that i can secure my things to my belt loop, and have my car keys handy. (3rd pic)http://www.instructables.com/id/the-anti-wallet/
takes up less space than a wallet in your front pocket, everything is secure, and since it has my keys too, it's all i have to carry.