The Vandal expandable backpack features a weatherproof main compartment which can be used in either “roll-top” mode, or in a traditional “flap-down” configuration. The backpack can quickly double in size from 1,800 to 4,000 cubic inches for extra cargo carrying capacity, and  front zippered pocket fits laptops and tablets.   The Vandal also features multiple weatherproof compartments, urethane coated zippers, waterproof materials, and a carbon fiber reinforced internal frame suspension system. Made in the USA with a lifetime warranty.