Aleshia DiBellawrote a review of Osprey Packs Hydraulics LT Hydration Reservoir on September 8, 2017
Familiarity: I've used it several times
Before this purchase I had a Platypus bladder and a cheap Walmart bladder bought on a whim. This bladder is ten times BETTER than those.
It is easy to fill. You do not have to struggle to screw a lid on or off. You simply zip it off. You can fill it completely 2.5 liters and still shut it. There is a little extra space past 2.5 liters which makes it easier to shut. When you fill it the bladder it stays pretty flat and narrow to fit perfectly in the sleeve of the backpack unlike some that fill up and become round. (Don't forget to put your bladder in first, before your other gear!) :)
Super lightweight!!! When it is empty it does not stay up on its own. Some people do not like this but that does not bother me. The lower the water level the more it slides/bunches up in the sleeve of my pack. (Not noticeable unless you open the pack)
Lastly, the bite valve is amazing. You can twist the grey part to turn it on or off. Sometimes while hiking I leave it open because I know I will constantly be drinking water. When traveling and throwing gear in the car I keep it closed so it does not get squeezed and leak everywhere.
FAVORITE BLADDER SO FAR!!!!!