GBX Gear Portable Pack Hydration System W/Bladder 100oz/3l (Forest) Using 600/900D waterproof nylon material, wear-resisting External insulation blanket insulation can be cool water for a longer time Size: 470 mmx254mmx25mm tank water bag 3L Weight: 510 g (water bag empty), 3.34 Kg (water bag full) EVA/TPU water bag (including the elastic water tube protector)