Love my Arc'teryx Khamsin 38 for light loads, and my Arc'teryx Khamsin 52 for bigger loads. The 52 weighs in at something like just over 3 lbs, which is significant when 3 lbs are 3% of one's body weight. The hipbelts on the Khamsins are very flexible, padded enough for bony hips, though. I wore a Mountainsmith Frostfire for years, and endured brutal welts on my hips and collarbone. Now I carry only my Khamsins. Have both in the small size, as I'm only 5'2". Thought about getting a Bora, but it weighs over 6 lbs and has a padded, uncontoured hipbelt, which still gives me nightmares after years with the Mtnsmithy.