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.