Camelbak bite valve makes all the difference
I lost the original bite valve off my Camelbak when my boyfriend tried to hike me to death up Perla's Ridge in Little Cottonwood Canyon. It slipped off as I was sliding up a scary section of rock with no protection and I wasn't about to go back down to retrieve something I could no longer see. Using the bladder without the valve (which I had to do for the rest of the trip) resulted in a lot of water spilled on my clothes. Upon return, a couple of bucks later: new bite valve in place, back to spill-free hydration. Thumbs up.