I had a knee injury that forced some serious weight reduction. I read Ray Jardine's book and that worked for me. I didn't follow his appoach completely, just too what worked for me. My 3 season base weigh is about 8 pounds right now. Swap in a warmer sleeping bag and some cold weather clothing, and I think 12 pounds base would be possible. I don't have any cuben fiber or titanium, but that will change eventually. That said pushing your the limits of pack weight during winter might result in a Darwin Award. If you want light, hiker the warmer months and if you don't make it 2190 miles that year, go back and finish later.