Backpack fit is almost as individual as shoe fit. I therefore would never recommend a backpack brand/model for someone else, any more than I would recommend a make of shoe.

Just as an example, while lots of folks love Osprey packs, their hipbelts and my hips do not get along--every Osprey pack I've tried causes pain.

Most important: The pack must fit your body, fit the load you're putting inside, and be comfortable for you with your gear inside (which should include the equivalent in weight and bulk of a week's food and a day's water). In other words, take your gear with you when trying on packs. Sandbags and weights are just not the same.