The Voltaic solar Backpacks are portable solar power generators designed to charge virtually all handheld electronics. Entrenched in the outside of the bags are lightweight, tough, waterproof solar panels. Voltaic Generators produce up to 14.7 watts, powerful enough to fully charge a distinctive laptop from a day of straight sunlight. No other solar bags can do this. Voltaic smaller bags are able to  produce 4 watts of power so 1 hour in direct sun will power over 3 hours of iPod play time or 1.5 hours of cell phone talk time.