so far, so good
I just got the 1.8L bladder to use with my North Face Chugach 16 pack. The bladder fits well in the hydration sleeve. The bite valve is a little large for the insulated sleeve in the shoulder sleeve though. I can get it zipped, but I can see it being a little difficult to do out on the hill, especially with gloves. Not a huge deal though. Other than that, the system functions as advertised. I like the large zip opening, and the bite valve delivers a strong stream. Overall a great product.