I had the same question and pretty much the same situation a couple of weeks ago. I really wanted a backpack but I knew the fit needed to be right. Went to REI and Tried a bunch on with weight. Ended up buying the REI Flash 65 because it fit and felt the best. Just got back from a 5 day trip in Costa Rica, now I didn't backpack the whole trip however did get some good time with my pack on and it felt great, also held all that I needed and more. I did however have to take the boots I recently purchased back due to them not fitting just right. It's a process but its well worth it and I can't wait to finally have all my gear. Good luck