Ready for everything from 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" 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.