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I use this Speck case. I need a substantial case for my phone because I will drop it at some point, and this one protects well. It holds two credit cards and my ID, so for most trips (groceries, bar) it's enough. I also have a minimal leather envelope-style wallet for other cards and a little cash, but I only carry it when I know I'll need them.
Speck Products CandyShell Card Case for iPhone 6/iPhone 6S Wallet Case - Black/Slate Grey [link]