The Flap Top Backpack is a hybrid bag that combines the benefits of the double strap backpack with the accessibility of the messenger bag. In addition to being able to carry your cargo in the waterproof compartment, you can also carry large and oddly shaped items strapped under the extendable flap. This waterproof backpack is designed to ride high on your back to comfortably distribute the weight and reduce blind spots when riding. The light loop and reflective strip keep you safe and visible in any type of weather. Features: Dual foam padded ergonomic shoulder straps Vinyl lined main cargo compartment with divider for laptop or important papers Vinyl lined front pocket with inner velcro divider Extendable main flap with velcro attachment and side release buckles Side pockets to fit a tool pouch, water bottle, or other items Exterior U-Lock holster, light loop, and wide reflective strip for visibility *Extra add-on features available as custom orders* Dimensions: small: 13" x 5.5" base, 16" and up tall medium: 14" x 6.5" base, 18" and up tall Volume: small: 975 cubic inches/16L medium: 1344 cubic inches/22L *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) If you would like to pick up your item at our retail location and bypass shipping costs use the promo code: Local Pickup