The Roll Top Backpack is the perfect companion for the bike commuter, student, or everyday urban adventurer. This bag is great for storing a computer, books, and a change of clothes. The expandable roll top closure with adjustable velcro strap allows for a serious grocery run, it can easily carry the extra 18 pack, a large puppy, or your kite collection. Black Star bags are completely waterproof and are designed to ride high on your back to comfortably distribute the weight and reduce blind spots while riding. The light loop and reflective strip keep you safe and visible in any type of weather. Features: Vinyl lined body and front pocket with inner velcro dividerVinyl lined main cargo compartment with divider for laptop or important papers Expandable velcro closure strap for larger loads Side pockets to fit a tool pouch, water bottle, or other items Exterior U-Lock holster, light loop, and wide reflective strip for visibility Dual foam padded ergonomic shoulder straps *Extra add-on features available a custom orders* Dimensions: extra-small: 11" x 5.5" base, 16"- 23" tall small: 13" x 5.5" base, 16"- 23" tall medium: 14" x 6.5" base, 18"- 26" tall Volume: extra small: 16-23L small: 20L-30L medium: 28L-42L *Large backpacks are available as a custom order, please email or call us* (due to the variation in monitor display settings, true image color may vary from screen to screen)