I'm not sure if you are talking about a pack for non-resupply in this post like in the post below. 65 lbs is not enough to go 1000 miles so it would have to be heavier and that means a Critical Mass pack. The lighter packs could do it but the burden on the body would not be worth it. Even though it would be a burden it can be an enjoyable burden. Based on the Arctic trip even, and you duplicated what their weight was, you would be up to 80 or 90 lbs and you have to account for extra food for the extra weight lose etc. Personall, I would go heavier, as heavy as I could, and work in quite a few easy days - am not recommending that for you. Trips like this would be for people that like heavy brutal work - you know an ex marine, or off-spring of Jack LaLane. I find the idea of seeing how far a pack load can go far more intriging than simply a long walk.