Bobby, they are both very good packs that will handle 3 nights and carry well. I have the Atmos 50 and have been very happy with it but you can't go wrong with either pack.

thanks Mike. i have a talon 33 and an older dana design I use for big heavy hauls (5500 cu in.) so am looking for a pack to fill the space in the middle of those two.

Hey Bobby, the only thing about the Exos is the lighter harness and hipbelt. So you will want to watch your load weight in this pack. 30-35 pounds max. The Atmos harness and hipbelt is more comfy for sure.

The Exos fit much better, now I am not sure to get a 46 of the 58? Any siggestions?