The RainwaterHOG is a design-y rainwater tank (yes, there is such a thing) that collects rain to re-use in the garden, give to your dog or fill up your Super Soaker without draining the mains. Most people don't save rainwater because they don't want a giant open bucket/mosquito-larvae farm on their porch. But now, you can store it away in a nice recyclable virgin polyethylene tank. Each HOG holds 47 gallons, and they can be linked up with each other. [RainwaterHOG via PopTech]