I've always carried a guy's wallet (and gotten a bizarre amount of flack for it from an otherwise very liberal crowd. Who knew that wallets were the trigger to send people back to the 50s, gender roles style?), and I've never had too much trouble fitting all my cards, etc, in there. EXCEPT for the fact that the leather slot things inevitably fall apart in just a few months. I know it's because I overstuff 'em*, so I guess my recommendation is to grab something cheap, shove all your crap in there, and then shrug and toss it 6mo later.
* I've got 20 plastic cards and 5 stamp cards in my wallet. Hey, if it fits in my ass pocket, who cares, right?