Bought this for what it was intended, that is carry cash etc.  Interesting thing is, I've gotten thru TSA machines 3 times now and haven't set off any alarms.  :-)  Have to say tho, I find it hard to believe it doesn't show up, they're just not being silly about it.

The strap looks a little flimsy but it remains tight against my chest the whole time I wear it and it doesn't irritate.