Sirrus 50

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Backpack for trekking and excursions with good accessibility. 50L backpack with removable mushroom and several pockets. Anatomical and highly ventilated back.


  • Backpack for women on field trips with medium and high loads in very hot conditions. Osprey recommends it for experienced hikers. With great accessibility to the interior and all the adaptations needed on long routes.


  • Women's back with mesh that features 3D tensioned technology maintaining resistance to pressure in any direction, as well as lateral ventilation outlets. Lightwire aluminum frame that manages to transfer the weight of the load to the bottom.

  • Ergonomic shoulder pads and lumbar belt with large padding and breathable material that provides great comfort and stability of use. The shoulder pads are perforated with mesh cover and super breathable fabric. Lumbar belt with material also highly breathable. The shoulder pads and lumbar belt adapt to the female anatomy.

Pockets and adaptations:

  • Closure with removable mushroom. The mushroom has two zippered pockets. One inside with a key clip and one outside with a flap. Under the mushroom it has a main pocket with rope closure with tanca. It also features a side zip opening to the main pocket.

  • Strap with attachment clip under the mushroom that serves to adjust the load or the carrying of rope.

  • Lower zip pocket for medium-sized items.

  • Exterior straps located at the bottom. These straps are adjustable for carrying sleeping bags or mats.

  • In its outer front it has a three-point adjustable compartment for clothes or light items. Also on its front it has a zippered pocket.

  • Large opening pockets with zip closure on the hip belt.

  • Pair of lateral compression straps. The lower strap is located over the mesh pocket, managing to adjust in addition to the main load also that of the side pocket if desired. The upper one is fixed on the front of the backpack.

  • Pair of rubbers placed on a shoulder pad and another on the bottom of the backpack. Allowing to be able to place a pair of poles temporarily in a very fast way while we use our hands for some punctual action such as picking up the phone.

  • Lower pocket for the waterproof backpack cover that incorporates the backpack.

  • With a front ice ax-pole holder with top clip and bottom strap.

  • With an inner hook and cover sewn to the rear panel where to insert the hydration bag. The mouthpiece is pulled out through a side opening.


  • Nylon 210D Crosshatch and Nylon 420HD packcloth.

More Information
Season of use Autumn, Spring, Summer, Winter
Ecological note (0 to 5) 1 🌱
Ecological Certificates EOCA
Brand Osprey
Volume (l) 50
For Woman
Dimensions (cm) 68 x 32 x 35
Size guide Pack Sizer
Weight (gr.) 1620
Activities Trekking
Hydration Systems Compatible and does not incorporate
Raincover Incorporates
Gear loop ice axes holder, light holder, ropes holder, sticks holder
Size WS/WM
Made in Asia
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