I recently bought a ULA Catalyst and completed a 50 miler with 30lbs.

loved the hip compartments and the top load and the compartment on back you can pack things in forever, the water bottle carriers. BUT

It just didn't fit/work for me. IT lays completely on your back, and you have to really cinch down the waist belt to get it to ride properly. I was looking for a lightweight pack that can handle 30-35lbs, and thought it was the one for me but can stand the way it lays on your back, no air movement at all. All the functions and design great, can you get a similar pack with some support? I up graded from REI Traverse 70, and liked the lumbar support. Suggestions. Probably be for sale soon.