I was referring to the Atmos 65. I got it just before the new AG suspension came out, but I believe the Atmos 65 AG is still over 4 pounds.
As for the suspension and hipbelt, it seems tougher and stronger than the weight recommendation suggests. I believe the recommended weight limit is 35 lbs, but I read
this before buying, and the guy says he packed 50-60 pounds often and did well. The shoulder straps are wider and more comfortable than my Atmos' were.
I think the Exos is Osprey's lightweight line. Looks like they've got the AG straps on it as well.
That suspension is really nice. Thick, soft padding on the shoulders.