Osprey
Sirrus 36
Best ventilated pack for long day hikes and lightweight overnight trips.
Designed for day hikers tackling challenging trails, the Sirrus 36 offers a comfortable and breathable suspension system for extended adventures. Constructed with 100% recycled materials, this pack features a top-loading design with a fixed lid for easy packing. Its AirSpeed™ suspension ensures excellent ventilation, making it ideal for longer treks and lightweight overnight trips. The pack includes a raincover, multiple access points, and attachment points for gear, ensuring readiness for various weather conditions and trail demands.
$159.90
Owner Satisfaction
4.5
/ 5
Category Rank
4112
/ 12980
#4112 in Backpacks
Price vs Category Average
+50%
Above average
Load Range
1530.714
/ - lbs / - kg
Who it's for
- Warm-weather hikers needing maximum back ventilation
- Women seeking a stable, ergonomic fit for long treks
- Backpackers wanting built-in weather protection for rainy climates
Who should skip it
- Minimalists preferring a pack that compresses when lightly loaded
- Organized travelers needing quick access to bottom-packed gear
- Hikers carrying large smartphones or bulky trail essentials
Performance breakdown
Ventilation performance
AirSpeed suspension creates a consistent airflow gap against your back.
Load management
Handles 15 to 30 pounds with impressive stability and weight distribution.
Access convenience
Multiple entry points make retrieving gear mid-hike effortless and quick.
Sustainability footprint
Recycled materials and PFC-free coatings set a high environmental standard.
Fit adjustability
Four inches of torso adjustment ensures a tailored fit for many.
Trail versatility
Smart attachment points accommodate everything from trekking poles to ice axes.
Key Specs
Load Range
15 - 30 lbs. / 7 - 14 kg
Volume
36 L
Dimensions
10.63H X 14.57W X 26.77D IN. / 27H X 37W X 68D CM
Weight
3.155 LBS. / 1.431 KG
Main Fabric
bluesign® APPROVED 210D recycled honey comb nylon, PFC/PFAS-free DWR
Lining
bluesign® APPROVED 420D recycled nylon, PFC/PFAS-free DWR
Bottom Fabric
bluesign® APPROVED 420D recycled nylon, PFC/PFAS-free DWR
Included raincover
Features
- Included raincover made with PFC/PFAS-free DWR and bluesign® approved materials
- Stow-on-the-Go trekking pole attachment
- Dual side compression straps
- Top loading design with a secure drawcord closure
- Hidden vertical side zip access into main compartment
- Zippered access lower compartment with a floating liner
- AirSpeed™ suspension system for breathable support
- Comprehensive fit system for tailored adjustment
What customers say
Customers consistently praise the Osprey Sirrus 36 for its exceptional comfort and robust quality. The innovative AirSpeed suspension system receives high marks for superior ventilation, keeping hikers cool and comfortable even on long treks. Users frequently highlight the pack's durable construction and reliable materials, affirming its longevity and ability to withstand rigorous use. The thoughtful design contributes significantly to an enjoyable carrying experience, making it a highly favored choice for day hikes and overnight adventures.
Know before you buy
With a 36-liter capacity and a recommended load range of 15 to 30 pounds, this pack is well-suited for lightweight overnight trips or long, gear-intensive day hikes. It features a lower compartment and multiple access points that make organizing overnight essentials much easier than a standard daypack.
The AirSpeed system uses a tensioned mesh back panel that creates a significant gap between your back and the pack body. This design allows for excellent airflow, which helps keep you cool and reduces sweat buildup during strenuous climbs in warm conditions.
Yes, the Sirrus 36 features an adjustable torso system that offers 4 inches of range. This allows you to fine-tune the fit to match your back length, ensuring the weight is distributed correctly across your hips and shoulders.
Yes, it includes a hidden vertical side zipper that lets you reach items in the main compartment without undoing the top lid. Additionally, there is a separate zippered lower compartment, which is ideal for storing a sleeping bag or items you need to grab quickly.
The included raincover is designed to provide reliable protection against rain and is made with PFC/PFAS-free DWR materials. While it is highly effective for most trail conditions, ensure it is properly cinched around the pack to prevent water from entering through the back panel area.
Yes, the pack is equipped with Osprey’s Stow-on-the-Go trekking pole attachment, which allows you to stash your poles quickly without taking the pack off. It also includes a single ice axe loop and front panel lash points for securing additional technical gear.
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