Deuter Streamer II Valve

"The Streamer II valve from Deuter offers an intelligent solution for anyone who needs a reliable and uncomplicated drinking solution on the go. This lightweight valve is specially designed to close automatically after every sip to prevent unwanted leakage. In addition, it can be opened and locked with just one hand, which makes it particularly practical for use on the move. Whether you're hiking, cycling or running, the unisex valve is the ideal companion for all outdoor activities."