Osprey Sirrus 50L Women's Backpack



Item #: 331893621

As the largest volume in the Sirrus series, the women’s specific Sirrus 50 offers proven AirSpeed™ ventilated suspension system in a volume perfect for overnight to weeklong backpacking trips. 

NOTE: Find in Store Inventory levels are continuously changing. Please contact store to confirm availability is as shown.


  • Upper Side Compression Straps - Dual upper side compression/carry straps provide load stabilization and additional external carry options
  • Stow-on-the-Go™ Trekking Pole Attachment - Osprey’s unique Stow-on-the-Go™ system allows users to tuck away trekking poles quickly without having to remove their packs
  • Mesh Side Pockets with InsideOut™ Compression - Dual side stretch mesh pockets with InsideOut™ compression allow for extra tension and more secure loads in the side pockets
  • Zippered Hipbelt Pockets - Dual zippered hipbelt pockets provide secure storage for often needed items
  • Tool Attachment - A single tool attachment loop with stowable bungie tie-off keeps external tools secure
  • Sleeping Pad Straps - Adjustable and removable sleeping pad straps provide secure extra carry
  • Floating Top Lid - A removable floating top lid with twin zippered pockets provides extra organization and can be detached to shave weight
  • Front Panel Access - Zippered panel load access to main compartment storage
  • Sleeping Bag Compartment - Wide mouth access sleeping bag compartment with divider compresses and stores bulky loads
  • Top Load Access - Top load access through a drawstring closure to main compartment


  • Volume: 50L
  • Weight: 3.26lbs. / 1.48kg.
  • Dimensions: 25 x 13 x 14" / 63 x 33 x 35cm.
  • Load Range: 25-40lbs. / 11-18kg.
  • Fabrics: Main (210D Nylon Dobby) Accent (420D Nylon Shadow Box) Bottom (210D Nylon Dobby)

Shipping Info:

  • Leaves the warehouse in 1-7 business days depending on order volume.
  • Items may be returned within 60 days of the order date to an Atmosphere retail store or an Atmosphere warehouse. Items must be returned unused/unworn and electronics unopened. See Online Return Policy and Return Instructions for more information.
  • Note: Shipping restrictions may apply based on location and product size.


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