Reebok Delta Collection Survivor Backpack w/ Water Bladder Port Nylon Fully lined lining Breathable PU ripstop / Dimensions: 17" x 11.5" x 4" Water bladder hole that can fit up to 16 Liters (Water Bladder NOT included) Water port can double as Padded inner laptop sleeve or tablet sleeve Water repellant bottom, Front and back reflectivity Side compression straps and front pocket with bungee system for secure packing