I know nothing about CamelBaks. I have seen exactly one in real life, and that was probably ten years ago. This isn't a "should I get one" or "are they better than bottles" post. This is information gathering in it's purest form. Here goes:

Are there standalone ones in addition to ones that fit into backpacks?
How do you clean them?
What sizes do they come in?
Are the various manufacturers designed fairly similarly, or are there major differences in design?
Can you put liquids other than water in them?
What is the life expectancy of one?
Are they all backpack set up, or are there other types, such as butt pack ones?
What else should I know that I haven't asked about?