good bite valve
i have two camelbaks,one with this valve and one with the standard. and i will say i FAR prefer this one, the standard leaks all the time (often into my armpit making me wonder why im sweating on the right but not the left!) but the lock on this one solves that problem ALMOST compleatly, i find if you lock it first then suck out the rest of the water in the rubber bite part you wont have any dribbles at all. i am frustrated though that the yellow locking mechanism on mine is starting to pop out, each time worse than the last and draining a good portion of my water out and onto me. but its worth saying that mine is many years old and for the couple bucks it takes, ill just get a new one.