The Voltaic Backpack is built tough for use as a weekend hike bag or as a large daypack. There are pockets and wire channels for multiple electronic devices and 1,850 cubic inches of storage space. It features high density padding in the shoulders straps and back panel for comfort, nylon mesh backing material for better airflow, an adjustable phone/ MP3 pouch inside. The solar panels provide protection for fragile items inside the front pocket and wire channels throughout the bag take power to the shoulder strap and for headphones, etc. It weighs 3.5 lbs ( 1,590 grams) including battery and solar panels and its dimensions are 20" high x 10- 15" wide x 7- 10 deep ( 51 cm high x 25- 38 cm wide x 18- 25 cm deep)