I used a GVP-3 pack two years ago for a 40-mile hike, Kearsarge to Whitney and was very pleased with it. It weighs 12oz. But, don't try to carry any more than 20 pounds. It's the same pack used by Brian Robinson on his triple crown. <A HREF="www.GVPgear.com">www.GVPgear.com</A> john