Ready for everything'sfrom sprinkles to a deluge this completely waterproof pack employs a roll-top design to keep water out. 420D nylon with TPU film laminate. Waterproof main compartment with roll-top construction. Easy-access removable laptop/tablet organization sleeves. Removable high visibility liner. Organization panel with two zippered pockets. Quick-access water-resistant front zippered stash pocket. Ultra-padded air mesh back with Air Flow System. Off-center removable hip belt. Dual Density shoulder straps. Two-way adjustable sternum strap. Strap containment system to ensure all straps are secured. Laptop sleeve: 14.5 h x 9.75 w x 1 d; fits most 15 inch laptops. Dimensions: 20.5 h x 10.5 w x 6.75 d (rolled). Capacity: 1 600 cu.in./26.2 L Weight: 2.5 lbs./1.49 kg. Bags not intended for use by children 12 and under.