The SolarStore is essentially a hot water heater that uses the sun as its energy source. Inflatable from a backpack, this guy will hold up to three full tanks of water and make it nice and toasty for your showering needs. It's a great, cheap alternative to hot water heaters, what with it costing a mere $200, but it'll be pretty much useless to anyone who lives in a climate that gets really cold in the wintertime. But for those in developing nations with the proper conditions, it could be a great choice. [Environmental Graffiti via New Launches]