It does the job, but the water valve is counterintuitive. In other words, when the valve is lined up and flush with the marker it is turned on. When the valve isn't lined up and the tab is turned to the side and susceptible to being bumped that is the off position. I would have designed it so that the valve is easier to be visually noted as in the off position and less able to be bumped and accidentally turned on. Also, the construction is very cheap for a $6 item. I have doubts about it's long term service life. I guess you are still paying for the Camelbak name, even with this little valve.