D...
Review confirmed by purchase 
I give it 4 stars in advance because there is a high risk of leaking from the mouthpiece, which lacks a cap and an additional valve. One could also complain about the lack of a cover for the tube. The reservoir itself is excellent, but it's difficult to "get water out of" the bladder itself. If it starts leaking (because the bitten mouthpiece will be used during use), I will come back to correct my rating. On the plus side is the capacity, as it holds up to 3 liters, but the filling hole in the backpack probably won't fit with other bladders.
