The Rig 500 features 500 ci. of dry packable space, our award winning Plug and Play Reservoir Tube Connectors, PVC Reinforced Compression Straps, Reflective Tabs and Zipper Pulls, Internal Storage Compartments and Organizer, Eco Rig Back Pads, Air Drive Ventilation, Heavy Duty Nylon Pack Handle and Vertical attachment hoops. The 500 is loaded with our 70 oz. hydration engine, quick-release valves for drinking tube and pressurization tube for easy refill and bladder removal, slide top for easy refill, cleaning and drying. Ergonomic Fit, Terraced Overlay for Adjustable Tube Configuration and Power Bulb Configuration, Industrial Load Disbursement cut and padding.