The X2 pack is amazing. Loaded with a full days supplies, including a 2L water hydration bladder, and it NEVER once felt heavy, or cumbersome. It also allowed me to take out an 80lb. elk quarter/with loins for 2 miles, and although it wasn't made especially for that, it did the job and saved my group an extra trip. I was the only one with an X2 and all the other guys now want one.
I don't have a ton of experience with the different brands of boots, but FWIW on our Colo. Elk hunt I wore the Vasque Taku's. They're very lightweight with great stability, my feet never got wet (gore-tex), and coupled with the green superfeet inserts, I never got a blister from out of the box to a week of hard mountain hunting. Hope this helps.