Where does it leak? The three camelbacks I have leak both where the tube meets the bladder, and the seal on the cap. I replaced the o-rings, and it stoped the leak from the cap, and I cut the hose a little and re-stuck it on. Both work to stop leaks for a few weeks or two. My sons little bladder that came with his Kelty Starfish has never leaked. I am not buying camelbacks again. <img src="/forums/images/graemlins/grin.gif" alt="" />