Yup - just the other day my road bike took off without me at a pit stop.

(Sorry, I just couldn't resist!)

I saw in a catalog something that is supposed to clean camelbacs. I think I'd just put a tablespoon of bleach & water, shake well & rinse a lot. I store mine with a papertowel stuck inside of it so that it doesn't grow nasty stuff.

I was out only 2 hours today but went through three water bottles, so I guess it's time to dig out the bladder...