In the famous words of EdT..."anyone can carry 70lbs of ultra light gear.." or something like that.
The point being, cut down on total items in the pack, not just the wt. of each item. Keep it simple, only bring what you really need.
And IMO better to carry 40lbs of gear in a 7lb. pack that carries heavier loads well than 50lbs. of "ultralight" gear in a 4lb. pack that sucks when packing 80lbs. of meat and gear.