I originally bought one of those metal credit card holders -- not because I was afraid of RFID info being swiped -- but because I wanted something compact for my front pocket.  It worked OK for a short while, then got dented, and then kind of fell apart.  Searching for an alternative, I stumbled on this little beauty.  It's light and spacious.  It feels good in your hands and seems to be of good quality.

I buy everything with my Amazon credit card and then pay it off at the end of the month (really!).  I use the points to buy Christmas presents at the end of the year.  That card goes in the outside pocket for easy access.  My two grocery reward cards go under the flap and my driver's license goes behind the see through window.  Another 8 cards go in the main pocket.  Despite all this, the holder sits flat in my front pocket and doesn't create a noticeable bulge.

I've had the holder for about a month now and couldn't be happier.