I got this for my new Aether 70 ag. Little did I know if you fill this thing up. There is no way you are going to get it into the sleeve on the pack. So I filled it with 1.5 liters of water. It was still all I could do to get it in there. It's not going to last long like that. The 1.5 liter reservoir may fit but this 3 liter does not. Not even close. Also I do not like that it takes two hands to open the bite valve. I may try a 1.5 liter. Anybody want this 3 liter before it springs a leak? I've only used it once and probably the last time. It's a great idea for convenience but I hike in the South. There is water almost everywhere.