They don't come any better than the Hydrapak reverseable II system.  100% leakproof, (believe us we have parked a car on one!!)

The clever system allows you to turn it inside out for cleaning, no special brushes needed here or camelbak cleaning agents.

System contains: Reversible Reservoir II, drink tube, bite valve, quickdraw tube attachment, plug-n-play connector, and straight bite valve base.