Ready for everything from sprinkles to a deluge, this completely waterproof pack employs a roll-top design to keep water out. Made of 420D nylon with TPU film laminate. Features waterproof main compartment with roll-top construction, easy-access removable laptop/tablet organization sleeves, removable high visibility liner, and organization panel with two zippered pockets. Includes quick-access, water-resistant front zippered stash pocket and ultra-padded air mesh back with Air Flow System. Complies with CPSIA, Prop 65.