I have this pack, it's been with me across four continents, and I'd buy it again now if mine wasn't in great shape! I'm 1.65 and the S is a good fit, might even be a little big on me. There are lighter packs out there, but this one is very sturdy.
RussBaileyTrue, if you're looking for the lightest pack this isn't it. Still, it's a great pack in that it's reliable, comfortable, indestructible, and has awesome pockets. Still, even though this newer model is lighter than mine, it isn't a zpack.