humangear GoToob+ Travel Tube: X-Large 177ml Clear

Made from a soft yet rugged silicone, the GoToob+ has a large opening making it easier to fill and clean. The bases are contoured so that they can stand up easily for filling. A lockable collar makes it almost impossible to accidentally open the cap, reducing the chance of leakage, and provides a handy loop to hang the tube from a hook or clip it to the outside of a pack. There's also a textured area on the collar to write in the contents with a permanent marker.