I have been using the Blacks creek alaskan. I am going to get a new pack this year, and it will be the Badlands 4500. I know alot of guys that use them. If you pack correctly, you should be able to bivy comfortably for a week in any weather and be able to stay around the 40 pound mark if not under. For great tips, check out Cameron Hanes book on backcountry bowhunting. There is no other that can compare to his back country methods. I have implored alot of his suggestions with great success. It sure is nice not having to pack back to spike camp only to return again in the a.m.