For those of you with a Kokatat hydration system: Does water dribble or leak out of the bite valve if you apply pressure to the water bladder? The reason I ask is that I just bought the new Kokatat Poseidon PDF, which has a built-in hydration sleeve in the back to hold their 1.5 liter hydration reservoir. My initial test with a 1.5 L cycling hydration reservoir installed back there shows that tightening the PFD's side straps applies pressure to the back of the reservoir, forcing water up the tube and out the bite valve. This seems like a huge design flaw to me - the hydration pack should be in a stretchy compartment so you can tighten down the vest as much as needed without squeezing the water bag. I have a second 3L hydration system from Osprey that's much more resistant to dribbling, and has a shutoff valve at the bite end to completely stop leakage. How well does the Kokatat bite valve resist dribbling?