Lisa Ball wrote an answer about Osprey Packs Kestrel 48 Backpack - 2800-2900cu in on June 11, 2013
Although I am a woman, I am 6'0" and 160lb. I went with a male's S/M. The hip strap just barely fits me. I have considered wrapping a shammie around the belt for a little bit snugger fit. It is still a very excellent pack. It fit well enough around the hips, but I wish it were a little more snug. I am a 29" waist.