I purchased this water bag to go in my Eberlestock Gun Slinger pack, as it turns out the 2 liter may have fit better but the product is still usable in the pack just not in the pouch made for a water bag. The quality of this system is very high, I would compare it to the MSR dromedaries in that respect, Some features are much better like the ability to wash it out when the seal is removed. The ability to hang it when out of the pack without a lot of modifications was a plus as well. The part I was most impressed with is the hose and mouth piece, the hose is some tough stuff far and away superior to you common camel back style bags. The mouth piece stays covered and does not leak. The only problem I had with it was getting it through the water line opening in my pack, I got it through but it was a tight fit. If you are looking for a tough hydration systems that should give you years of service this is it.
Pros: Well made with good materials
Cons: Tight fit on the hose
This review was written in the old system and had content requirements that are different than reviews written today.