OK, I've been reading through various posts on this forum and I'm getting that Platypus water containers are the way to go, as opposed to, say, Camelback.

How much lighter is the Platypus than the equivalently sized Camelback? I've searched for this information, but come up short.

The only recurring complaint I've read about the Platypus is about the small size of the opening for filling the container. This zip-up model appears to solve that problem (perhaps at a slight weight cost?):



Somewhere on this forum I read that the Platypus bladder isn't suitable for filling with hot water, as in, melted snow. Is this also because of the small opening, or is there some other reason they can't be filled with hot water?

And finally, is there any reason to prefer one brand, or form of chlorine dioxide treatment to another?