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This backpack from Voltaic Systems has three durable, waterproof solar panels across the back of it which generate up to 4 watts of power. If you are a hiker or do a lot of outdoor activities far away from outlets, this seems like a must have, especially for the safety of being able to call for help if needed. It can be used to charge smaller gadgets like phones and iPads, but won`t work for larger items like laptops. Pretty cool.
image source: http://www.slipperybrick.com/2007/01/voltaic-solar-backpack-charge/