Crux Reservoir is a water tank that holds up to three litres of liquid and fits into almost every backpack. It allows 20 per cent more water flow per sip than previous systems. It features a Big-Bite mouthpiece, which closes safely after drinking. In addition, the valve can be manually closed. The hose is easily detachable thanks to a coupling and can be quickly filled en route. The light-weight drinking system is made from antibacterial, resistant polyurethane.