I have an Arc’teryx Bora 95 for long hauls, so I’m used to quality and good fit. The Atmos amazed me. It was SO light, and I don’t know WHAT it did with the weight … but … I was literally jumping up an down on the trail (I have a Marmot Swallow, so my tent has a chunk of base weight to begin with).
I read reviews of both the Arc’teryx Bora and the Osprey AFTER I bought the Osprey. I have been spoiled in my choice of both. The statement on Osprey that they lead the way, set the standards for other packs, is well noted. I looked at a Gregory as well as some EMS ones … the Osprey was awesome by comparison even in the store. I cautiously kept sales receipts and such for until I loaded and tested it … this one WON’T be returned.