Osprey Packs Atmos AG 50L, 65L Backpack

We’ve read the reviews across the web for the Osprey Packs Atmos AG 50L, 65L Backpack and summarize the results below:

Universal Ranking

PeakScore: 94 (out of 100) 
User Rating: 4.8 stars   
Expert Rating: 4.5 stars
Number of Ratings Reviewed: 78

Pros & Cons

Reasons to buy:

User Reviews

  • The Anti-Gravity system is not a gimmick.
  • The pack really does feel like it’s floating on your back.
  • Excellent ventilation.
  • Loaded with well thought out features.
  • Great for 4 season use.
  • Fit is adjustable.
  • So good at carrying heavy loads that it turns backpacking into a pleasure.
  • Side water bottle pockets are super convenient and easy to use.
  • Great for all types of outdoor adventures, ranging from backpacking to ski mountaineering.
  • The anti-gravity system is truly unbelievable.
  • By far the best backpacking pack I’ve ever owned.

Expert Reviews

  • Exceptionally comfortable.
  • Excellent organization, ventilation, and great pockets.
  • The shoulder straps are incredibly comfortable.
  • The anti-gravity system effectively spreads the load out across your back and hips.
  • Compared to similar packs, it is about average weight with well above average performance.
  • Well-designed storage, durable, and the suspension of weight by the anti-gravity system is unbelievable.
  • This could be the most comfortable backpack ever made.

Reasons NOT to buy:

User Reviews

  • Doesn’t carry extremely heavy loads as well.
  • The outside pockets on the back are hard to fill if the main pack compartment is already full.
  • Can be challenging to get the fit just right with the anti-gravity system.
  • The hip belt is somewhat limited in the sizes it can accommodate.
  • Hip belt pockets can be hard to unzip.
  • Volume feels like it is actually less than is advertised.
  • Sleeping bag compartment is too small for large sleeping bags.
  • The top horizontal frame bar can hit the back of your head if you look up.
  • Fitting a bear canister can be tight.
  • Fabric not as tough as arcteryx bora.
  • I would prefer that the two large pockets on the back of the pack were instead a part of the main compartment. I keep thinking about cutting a hole through the internal material to join them all together into one big pocket inside.
  • Pack sometimes squeaks.
  • The top (“brain”) can’t be used as a daypack.

Expert Reviews

  • Not great at carrying extremely heavy loads.
  • It is a little on the heavy side.
  • Cluttered with too many zippers and straps.
  • Attaching bulky gear to the outside is difficult.


The Osprey Packs Atmos AG Backpack just might be the most comfortable pack ever made. The ease and comfort with which this pack carries loads is exceptional. For backpackers prioritizing a pack that carries loads comfortably, the Atmos is the clear choice.


Note: User rankings were reviewed across the web and expert rankings were reviewed on sectionhiker, backpackers, outdoorgearlab.