I got mine from a place called Solar World because they had the best price at $319. They are made by Powerfilm. I already owned a clamshell type of panel, but the panels are on the outside and I wanted something better so I searched the net and took the plunge. Says marine grade and actually looks like thick vinyl. It rolls up to 4 or 5 inches and the optional connectors made it seem versitile. Strong enough to power a 12v car fan bought at Wal-mart (for tent ventilation).

I had read somebody's blog about a kayak trip where it was used to charge his laptop. Smaller sizes are available and pics show them hanging from backpacks to charge batteries while hiking. Mine is the largest model and at 6 feet I may have overdone it on size, but it is light and could be slung on top of a tent to get better light.