We use solar panels that deliver the highest possible charging capacity in their product class, delivering 12 W of power and capable of a 2.4A fast charge, perfect for charging phones, tablets, smart watches, action/digital cameras and many more portable electronic devices. The Solar Backpack has a 20 L capacity. 100 percent waterproof and designed to float. This pack can store and protect everything you need for your adventure. This pack also supports side bottle storage; a padded removable laptop compartment and a touchscreen friendly compartment for you to protect and operate your smart device.