I purchased this hydration system to go in my Eberlestock G4 Operator pack. It fits perfectly in either side pocket and the attachment point at the top of the bladder ensures that the system stays upright in the pocket (which allows all the liquid to flow to the drinking tube). The quality of this bladder is superior to any of my other camel-back-style bags and the dual options for opening the bladder makes it very easy to clean and dry between uses.
Pros: Good quality, easy to clean and dry
Cons: None
This review was written in the old system and had content requirements that are different than reviews written today.