I've been looking for a wallet which is:

  • Very small/thin
  • Not RFID blocking
  • Holds cash
  • Holds ~6 cards
I finally found one that works for me, the 

SlimFold Minimalist Wallet:

Also available at: https://www.slimfoldwallet.com/

Only downsides so far are that the cash compartment is a little hard to use, but it's still pretty good.