I went through the same thing a while back.  I gave up my wallet for a small leather business car holder about the size of or maybe a little thinner than the LA Wallet.  Holds my driver's license, checkcard, credit card, insurance card, son's insurance card, a couple of business cards (go figure) and a phone card (for emergencies).  I don't use cash for anything these days so that isnt and issue, but I do usually keep one or two twenty dollar bills in there for emergencies as well.  
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Learn to improvise everything.