The louder material won't make a difference to me at all as this appears to be a pack to haul in a remote camp, not a hunting pack. If I got that pack, it would be wherever the tent is at and not up and down the mountain chasing elk or mulies where I would have to worry about noise.
It's a 3800. The 4500 weighs 7lb 13 oz. This weighs 3.8 lbs.I guess you're right on that. Forgot it was a 4500.