I'm looking for a new pack. Presently I have a Alps Caldera 4500 (at 5lb 14oz). I like the pack but have a problem with the hip belt not staying tight and have replaced the shoulder straps once in less than a year. I am looking for something lighter and maby dropping down to a 70L. But don't think I can go any smaller. Any ideas out there? I do like Osprey.