I'm looking for a new winter pack myself. I thought I needed a 75-80L pack too, but I need to put my winter gear in a box and measure it to get the true amount. I thought my old and current winter pack was around 5500 ci which is a panel loader. The zipper on one side has a tooth missing now after I tried to pull in open, I had worked over the slider, but that wasn't enough, so that side is no longer working. I could have it sewn shut, right now I have a few safety pins holding it. I was looking at the Aether, but I want a top loader, I can see why pro's go for the top loader, no major zipper failures. I can wait, I'm getting my dual sport motorcycle set up for camping at the moment, so new bp gear and old stove acquisition is on hold or scaled back.
Duane