I'm on my second one in the past 20 years and would never go back to a regular wallet for the back pocket.  Don't know where you travel, but my new one is RFID so somebody in the airport or state fair can't steal my identity.  This is the one that I currently have. Plenty of room for credit cards, conceal carry, and cash.

http://www.walletgear.com/buxton-rfid-front-pocket-money-clip-wallet.html