The name's a little redundant — after all, we wouldn't have paper if it weren't from the sun. But Solar Paper isn't referencing the printed word. It's just the lightest, thinnest solar charger in the world. At just 0.15-inch thin, it's able to slide inside a book without a noticeable bump, and it weighs just 4 oz., or less than that notebook you carry around. Lest you think it's performance is compromised by its size, it can charge the power-hungry iPhone 6 in just 2.5 hours, and it's easily expandable thanks to a magnetic hinge design.