What is the average amount of weight that is carried in a pack of this size? I am 6 ft. 150 pds., but because I have a back injury, I doubt that I could handle a pack of this size. How stable is it when fully loaded and strapped in? I find that the larger the pack and the greater the weight the more important it is to have wider and thicker shoulder and waist belts.
Don Bowie (see post above) said that he took these up to Camp 2 on K2. That's 6700 meters (22,000 ft.). I have the El Sportiva Glacier and use these with great satisfaction when I hike the winters down into the Grand Canyon. They are comfort to the extreme, even though my feet are a bit wide and easily get cold, but not with Patagonia liners and Smart wool socks. I normally wear a 10.5 running shoe and a 44 La Sportiva is a perfect fit! No break-in was needed.