I am a 5' 4" male. I got the S/M hip belt, being a S/M person. It barely fits and I'm debating getting the bigger size. Unless you have tiny hips or are very skinny, get the bigger size. The pockets attached to said hipbelt are also small, but can hold a compass, clinometer and a pocket knife. The pros far outweigh the cons though. I love the color and fit around the shoulders. The large size is taller than a backpack and has several easy stash pockets. The water bladder is critical for long hot days outside and the back panel vents well. My last two Ospreys were stolen, so I can attest they are the best packs out there!
Eric the Forester