3-liter BPA-free bladder with an easy clean, big bore top Magnetic bite valve holder Thermal lined bladder compartment helps keep fluids cool Sternum strap and buckle keep gear secure Pack harness is angled away from the underarms giving total freedom of movement Harness made with air mesh for ventilation Neoprene hydration tube sleeve helps keep fluid cool Large main compartment and a secondary compartment with internal mesh pockets for organization Straps on the front to cinch down additional luggage Reverse face YKK« water-resistant zip on front Micro fleece lined glasses/media pocket THOR reflective logo 1200D Ballistic polyester/600D reversed faced poly shell Dimensions: 20öL (50.8 cm) x 11öW (27.94 cm) x 6öD (15.24 cm). HYDROPK S9 RESVR 3L GY/BK