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Osprey Packs
Atmos AG 50L Backpack

5 out of 5 stars
2 Reviews
Color:Mythical Green


Size Chart


Why We Like The Atmos AG 50L Backpack

When it comes to long-distance backpacking, our backpack's comfort is just as important as a good pair of hiking boots, and the Atmos AG 50 Backpack is Osprey's best-fitting backpack built for multi-day or overnight adventures. Multiple adjustments move the padded shoulder straps up and down the spacer mesh back frame for an exact fit to put ventilation and cushioned support right where we want it. The padded Fit-on-the-Fly waist belt lets us buckle, cinch, and go without hassling with a bunch of micro-adjustments.


  • Osprey's best-fitting backpack for multi-day treks
  • 50L capacity suitable for multi-day or overnight adventures
  • Anti-Gravity suspension is well-ventilated and cushioned
  • Shoulders adjust up and down back panel for a custom fit
  • Fit-On-The-Fly waist belt ensures a quick-and-easy fit
  • Removable FlapJacket top lid minimizes weight
  • Internal sleeve accommodates 3L hydration reservoirs
  • Bottom sleeping bag compartment and removable sleeping pad straps
  • Item #OSPZ1CE
[main] 100D x 630D nylon dobby [accent] 210D high tenacity nylon [bottom] 420HD nylon packcloth
[small] 47L (2868cu in), [medium] 50L (3051cu in), [large] 53L (3234cu in)
Anti-Gravity suspended mesh, LightWire tensioned frame, ExoForm wrap upper
Shoulder Straps
Anti-Gravity mesh
Waist Belt
Hydration Compatible
internal sleeve (3L capacity)
2 side, 1 zippered top, 2 zippered waist belt, 1 front mesh
Ice Axe Carry
Trekking Pole Carry
Sleeping Bag Compartment
Weight Capacity
25 - 40lb
[small] 30.7 x 14.9 x 15.3in [medium] 32.7 x 14.9 x 15.35in [large] 34.65 x 14.9 x 15.35in
Claimed Weight
[medium] 4lb 5oz
backpacking, hiking, camping
Manufacturer Warranty

Overall Rating

5 based on 2 ratings

Review Summary

1 Stars - 0 reviews
2 Stars - 0 reviews
3 Stars - 0 reviews
4 Stars - 0 reviews
5 Stars - 2 reviews

Fits Slightly Large

Screen reader users: the following list provides a visual scale to illustrate the product fit. Please refer to the heading above for the fit type in text.
Runs smallTrue to sizeRuns large

What do you think about this product?


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5 out of 5 stars

May 24, 2024

One of the Best

I've put it through the wringer
Size Bought:
5' 7"

This is one of the most critical pieces of gear from my 2023 Appalachian Trail thru-hike. Before I had picked any of my other gear, I knew my pack would be an Osprey. It didn't take much research to settle on the Atmos 50. This thing is a beast and could handle anything I threw at it or in it during my hike. The best feature is the one everybody already knows well: the airspace and ergonomic curvature that perfectly forms to your back. Furthermore, this distributes weight very efficiently, allowing your hips to bear more of the burden and relieve your shoulders. Other features I love include the waist pouches where I stored quick access items like my multi-tool and hand sanitizer, the included rain fly for quick rain protection, and the angular water bottle holders on each side where I had quick and convenient access to my one liter Smartwater bottles. I even made regular use of the two pockets in the brain portion. The interior dimensions are sufficient to fit a bear vault of the largest size turned sideways. There are straps on the bottom end of the pack that frequently held my tent, though you could also extend the top straps for the brain and store your tent under there too. The shoulder straps are thick and comfortable. I was able to attach a phone pouch on one and regularly attached my umbrella to the other. The materials are rugged. Despite all the use and abuse, scraping on trees and rocks, repetitive motion abrasion, weather exposure, and slinging around, the pack held up well without failure for 2,000 miles. There are probably adjustments I could have made to reduce weight, as this comes in at 4.2 lb. This while most thru-hiking packs in the ultralight category are less than half of that. With Osprey you're getting two extra pounds of comfort, in a sense. Alternatively, they do have the Exos 58 that weighs less. Also, regarding sizing, I think osprey could improve by separating them out into four: S, M, L, and XL. Other lesser known UL brands do this, so I would think osprey could handle it. This is my only real "complaint". All around, Osprey is, in my book, the best backpack maker in existence.

Jonathan B
5 out of 5 stars

August 16, 2022

Incredible pack minus the weight

I've used it several times
Size Bought:
5' 8"

Absolutely love this pack. It's the most comfortable I've used, but it's quite heavy. You trade weight for overall comfort when loaded up. If the majority of your kit is relatively light I would highly recommend this pack.

Jason J