I have a Go Lite (2 lb, 2oz) ultra-light but have been eyeing the Gregory Z65 (3 lb, 3oz). I found the Go Lite hip/shoulder straps too meager for long distance hiking even with a light < 30 lb load. When I thru-hiked in '94 I had a Dana Design (7 lb. 7 oz) internal that was durable as hell and is still in use if you can belive it. But technology has improved a lot since then. If I were to do it all over again - I'd shoot for something like the Gregory Z65.