The BMW is pretty similar to regular mens wallet. 4.5 inches tall, 3.5 inches wide.
It has two compartments for cash, 3 credit card slots. It also has a zippered compartment for card to wallet, and built in flaps for an envelope load.
Currently, I have 7 credit cards, 6 business cards. 2 packet tricks (poker size cards), and $3 bucks cash in my wallet. It measures out to .30 inches deep.
Hope that helps!