Both my wallet and passport case are RFID blocking. They're a matching set that hold all my cards and more. Besides my passport the only card that I carry that has RFID is my Nexus card which I keep in the sleeve as an additional layer of protection. I've had identity theft twice, live in NYC and travel often enough where I just don't need the hassle.
I learned my wallet was RFID blocking when I was working at a client's office which does all access to restricted areas via RFID tags and I couldn't just tap my back pocket to the sensor to open a door while carrying boxes of samples.