Don’t have anywhere to charge up your smartphone when you’re at school? Get a solar backpack. They have a small solar panel built into the backpack itself, to charge your electronics whenever you’re outside ~ or under harsh indoor lights.
A solar-charging backpack is especially useful when you’re out hiking, backpacking, or even on a long road trip (leave the backpack on the rear deck of the car, in full daylight). It can either charge up your electronics directly or charge an integral battery. Very helpful if you have an older vehicle with no USB charging port.
When the power goes out, you have a ready source of 12-volt power to charge up your electronics. Pack up all your things for a day at the beach, confident that you’ll have the use of your smartphone or tablet all day long, for communication, music ~ videos!