I read a lot of reviews for similar products that contained the word "flimsy." Found this Sharkk Aluminum Credit Card Holder with better reviews than most (check the reviews for all the different colors - wish Amazon would aggregate them because a red one, a black one and a blue one should still be the same).

The latch and hinges seem fairly sturdy but they are plastic so I'm planning on treating this gently. I wasn't expecting an Anvil Case for the price I paid:) And the aluminum part seems sturdy but isn't too heavy to carry around, though I wouldn't run over it with a car. I don't expect anything like this to last more than a couple of years but if I get that long out of it I'll be happy. If it breaks before then I'll post an update.

BTW, does anybody actually know if these things truly provide protection from RFID readers?