There is just something about this concept that I find simple yet very functional. I can see my self taking this camping and even using at home on a daily basis.
My only questions would be how long it would take to charge on a general day and how easy it would be to roll it up properly to the different sizes. My thought would be it would be easier to make it a one size box with circular battery cases you could slide it into for various sizes.
Overall, I would like to see how easily something like this could be build. Great concept that won an IF Concept Design Award in 2012