600 denier polyester. Bottom gusset expands to 6". Two front adjustable strap ensclosures. Exterior zipper compartment on flap, and slip pocket on back. Main compartment with a zipper enclosure. Front panel has a zipper compartment and organizer. Various accessory pockets, including padded velcro pouch, and detatchable key ring. Attatched carrying handle. Adjustable, detachable 1 1/2" shoulder strap. Laptop and PDA friendly. Size: 17" X 13" X 4"