The Voltaic Converter is our most versatile model. It is a small light weight day bag with a compartment for a water bladder, so it is ideal for biking & hiking. Multiple attachment mechanisms mean it can work as a pannier on a bicycle, a tank bag on a motorcycle, a saddle pack, or a day bag attached to a lager rucksack. 4 watts of solar power for fast charging The solar panels protect fragile items inside Included battery pack which stores power until you need it 11 adaptors for easy connection to handheld electronics Fully padded to protect laptops. Fits up to a 17" Mac Powerbook (15.5" x 10.5" x 2" or 39cm x 26cm x 5cm) Wire channels throughout the bag for headphones, bladder tubes etc. High density padding in the shoulder straps & back Can be worn as a backpack or sling bag Mesh backing material for better air flow Shell uses 600D fabric made from recycled PET (soda bottles), which is tough, water resistant & light weight. Note: It is not designed to charge laptops, it will however charge cell phones, sat phones, PDAs, GPSs, iPods, cameras & most other handheld electronics