Comms, you have a point, and in some ways I agree the concept of key gear on you is a good thing.

But there are lots of ways around it. One idea is a fanny pack - they have sizes from the truly ridiculous, practically a duffel bag, to a runner size that holds a deck of cards and a 1 pint water bottle. You could probably strap one around your bag, and still pop it off when you wandered away.

Of course, I like the thigh rig; haven't tried it, but it reminds me a bit like the MOPP gear bag. Maybe a good idea, if you like a big sweaty spot on one leg.