JonathanSWwrote a review of Ultimate Direction Water Bottle - 10oz on August 31, 2013
Familiarity: I've used it several times
My Ultimate Direction AK vest came with larger water bottles (which I found hard to use because of the bite valve). I replaced them with these 10oz bottles and prefer this configuration. The valve is low tech, but isn't leaking even after several cycles through the dishwasher.
A further advantage of the 10oz size is the lighter weight on the chest of the race vest (obviously the lower capacity is the inescapably associated disadvantage).