You could add Deuter to that list.

If your backs are good and you don't need much frame support you can lighten the pack weight considerably with some light weight packs made by the ultra light small gear suppliers. Keep in mind you sacrifice a bit of durability with some of the lighter fabrics depending on how rough you are on your gear. With care you can get good mileage out of them and reduce your overall load. Lots of links here on the sight or use the search feature here as well.

jimmyb