2-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 Internal mesh pocket for organization Neoprene hydration tube sleeve helps keep fluid cool Reverse face YKK« water-resistant zip on front Micro fleece lined glasses/media pocket THOR reflective logo 1200D Ballistic polyester/600D reversed faced polyshell Dimensions: 16öL (40.64 cm) x 8-1/2öW (21.59 cm) x 2öD (5.08 cm). HYDROPK S9 HYDNT 2L GY/BK