The EnerPlex Pack Executive Solar Powered Backpack is a revolutionary solar integrated backpack, able to keep anyone charged up while they're on the move. Equipped with a flexible and incredibly rugged integrated 3 watt solar panel, the Pack can power up most smartphones in under five hours and can charge almost any portable USB enabled device. Made with solar-on-plastic technology, the solar panel adds minimal weight while remaining flexible enough to allow the bag to be fully packed without risking damage to the panel or bag. Grey.