Every ECOWATT backpack and bag comes equipped with a solar panel. These panels are lightweight, durable, and waterproof.  Our line is divided purely on the basis of panel strength, and is classified as either high powered or low powered.  The high powered bags offer stronger solar panels to power devices that require greater energy such as a laptop.  They have a power capacity of anywhere between 5 and 20 volts.  The low powered bags are designed to power handheld electronics that need less energy such as ipods, cameras, phones, and gps devices.  The power capacity in these bags is 5 volts.