yeah, what she said. Don't make any assumptions using your height. I'm 6 foot and 200 pds and I still only wear a medium pack. As it turns out, all of my height comes from my legs. Also, get your back size measured by a couple of people. The first measurer (if that's a word) told me the measurement was 19.5 inches (indicating a "large" pack) and the next two people told me 17 inches (indicating a "medium" size pack). All from REI.