The Osprey Atmos 65 AG is our OutdoorGearLab Editors' Choice for Comfort and Ventilation because of its ultra-comfortable frame and suspension. Not only is it comfy and well-ventilation, but it features one of our review teams' favorite overall pack designs. Plus, the new 2018 model features improved shoulder strap padding that tapers depending on the location. It's also uber cushy around the wearer's shoulder straps and was easily one of the most comfortable packs we tested. As far as its suspension goes, once you put the Atmos 65 AG on, you'll be surprised how evenly the AG or Anti-Gravity suspension spreads the load out, creating a relatively even, and pressure-point-free feel. The AG suspension takes the trampoline-style suspension to a new level, incorporating the entire back panel and the waist belt; this makes the Atmos comfortable and able to carry loads up to around 40 lbs, making it the best feeling pack (to carry) in our review. Not only is the Atmos an excellent contender, but it features a ton of user-friendly pockets that will keep even the most organizationally driven backpacker happy.
The Atmos is also available in a smaller, lighter pack. The Osprey Atmos 50 AG is 1 pound lighter, as well has being $30 cheaper than its 65L counterpart. You still get all the great features of the Atoms 65L, but if you're needing something that's a bit smaller the Atmos 50L is your pack.