I learned from my chiropractor 20 years ago that large, bulky wallets in your back pocket are constantly protruding from under your legs and back. Since then I always put my wallet in the front left pocket (this also prevents possible pickpockets), so the thinner the better. I also like having my money readily available when looking for cash. It fits 10 credit cards, my ID, a couple of receipts and is pretty thin and comfy when full.
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