I used this for a trip to Italy a few weeks ago. I like that i was able to keep everything i needed with me, and not have to worry about being pick pocketed.  The first day, i tried wearing this under my clothing (on the inside of my pants) and really didn't like it. It was very uncomfortable and nearly impossible to get at the money.  I ended up wearing it as a belt, under a jacket, so that nobody saw that it was there.

I was able to fit cash and a few credit cards, as well as the hotel room key and my ipod.  It was a pretty good size for me.