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Item # OSP1G204M

Osprey Atmos AG LT 50 Internal Frame Backpack

Purchase Atmos AG LT 50

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Applying a "less is more" philosophy, the Osprey Atmos AG LT 50 uses the iconic Atmos as its blueprint but has a streamlined silhouette and a simplified feature set for backpackers who still want carrying comfort but want to minimize weight.


  • AntiGravity suspension system balances weight, breathability, and load-hauling capability: The pack uses suspended mesh and a lightweight powder-coated perimeter frame to competently haul up to 35 pounds while providing airflow to help keep you cool and comfortable.
  • Built-in torso adjustability: An easy-to-access injection-molded "ladder" allows you to adjust the torso length of the pack for a customizable fit. The pack also comes in two sizes to accommodate different torsos. The Small/Medium best fits 17"-20" torso lengths and the Large/Xlarge best fits from 21"-23".
  • Sustainable construction that doesn't compromise on functionality or durability: Tested to ensure that they meet Osprey's demanding technical requirements, the fabrics used on the pack are bluesign-approved and the protective durable water-repellent treatment is PFAS-free.

Check out all of these other special features!
  • Included raincover keeps your pack and gear dry in inclement weather
  • Curved zip access on one side of panel
  • Floating top lid with lash points
  • Fabric reinforced front shove-it pocket
  • Tall dual-access side water bottle pockets
  • Dual upper and lower side compression straps
  • Dual zippered hipbelt pockets
  • Dual ice axe loops with upper compression strap capture
  • Removable sleeping pad straps
  • Internal hydration reservoir sleeve with center back exit port (hydration system sold separately)

California residents: view proposition 65  Warning

Technical Specs

Best Use
Backpacking, Hiking
Top loading with side access
Item Dimensions
Small/Medium: 32.68" x 13.78" x 11.81"
Large/Xlarge: 34.65" x 13.78" x 11.81"
Fits Torso
Small/Medium: 17" - 20"
Large/Xlarge: 21" - 23"
Frame Material
4mm LightWire Alloy
Hydration Compatible
Maximum Weight
35 lbs
Sternum Strap
Yes; Adjustable
Torso Adjustment
Small/Medium: 3051 cu in
Large/Xlarge: 3234 cu in
Limited Lifetime
Internal Frame Backpack
Main: bluesign approved recycled 210D nylon honey comb contrast, PFAS-free DWR
Accent: bluesign approved recycled 210D high tenacity nylon, PFAS-free DWR
Bottom: bluesign approved recycled 500D high tenacity nylon, PFAS-free DWR
Item Weight
Small/Medium: 4 lbs
Large/Xlarge: 4.18 lbs
Raincover included

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