Ha! Choose a float with no portages!
What kind of camera do you have?
I was told my new camera (Canon S3 IS) would eat batteries like crazy, draining 'em after a few minutes, but I haven't found that to be the case, especially with the rechargables I just got. I do wish it was waterproof though. I like the idea of the solar camera bag for remote locations, but like you, I wouldn't want to haul it around! I think Real Goods also sells just the flexible solar panels, which would be much lighter. They roll up fairly small too.
Dawn