The Voltaic Generator Laptop messenger style bag is the first solar bag actually powerful enough to charge a laptop, and it does it using the latest, state-of-the-art high efficiency solar cells. It includes a battery pack custom designed to efficiently store and convert the electricity generated. It will also charge cell phones and most other hand held electronics, making the ultimate accessory for the eco-minded. The solar panel generates up to 15 watts using 20% efficienct cells, enough to fully charge the Voltaic battery in about five hours. The solar panel is waterproof, scratch resistant, and UV resistant.