I would echo what Mouse and Glen say. A few months ago I went into REI to buy a pack during a sale. My previous one, which I still have and like is a REI Flash 62, but I needed more volume for an upcoming trip. I had my mind set on getting an Osprey pack since so many people love them, but the reality was that they just weren't comfortable for me. I ended up getting a Deuter ACT 65+10 which I find really comfortable. It isn't the lightest, but neither is it the heaviest, but the real key is that it fit ME very well. Having the salesperson adjust it for me helped a lot, too.