I bought he Osprey Aether 70 pack and it came with the Isoform hip belt. I purchased the pack in-store and they were able to put the hip belt in a specialized "oven" to heat it up and mold it to my hips. Normal hip belts will naturally mold to your hips eventually, but it can take months of hiking to do. The whole process only took about 20 minutes in the store. My only complaint with this hip belt is that it doesn't have storage pockets on the side. A lot of new backpacks will have added pockets on the hip belt for quick access storage. Other than that, this is a very comfortable hip belt and is truly customized to your body!
I left my hipbelt in a taxi in Korea and had to travel around SE Asia and India for 2 months without it. My back will never forgive me for that. Life changed for me that great day in June when I walked into the Chicago Moosejaw and the kind folks helped me pick out a brand new hipbelt. Now I'm back in Asia, my back feels great and my overall attitude towards life has brightened! Thanks Moosejaw!