Capacity: 1200 Cubic Inches. Fabric: 100% Heavy Duty Dura Oxkin. Bladder: It Sprays! 100 oz., quick-release valves for drinking tube and pressurization tube for easy refill and bladder removal, slide top for easy refill, cleaning and drying. Zippers: Heavy Duty Size 8 Coil Zippers. I-Pod Ready Compartment w/ Waterproof Zipper Garage. Waist Strap: Removable System. Shoulder Strap: Ergonomic Fit, Terraced Overlay for Adjustable Tube Configuration and Power Bulb Configuration, Industrial Load Dispersement cut and padding. Chest Strap: Integrated slider chest strap. Additional Features: Plug & Play Reservoir Tube Connector, Compression Straps, PVC Reinforced Exterior Side Storage Pockets, Reflective Zipper Pulls, Internal Storage Compartments and Organizer, Eco Rig Back Pads, Air Drive Ventilation, Heavy Duty Nylon Pack Handle