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Osprey Packs
Siskin 12L Hydration Backpack

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Size Chart


Why We Like The Osprey Siskin 12L Backpack

The Osprey Siskin 12L Backpack has one goal— to keep us riding in comfort. The Atilon foam framesheet helps distribute our load evenly across our body while the AirScape backpanel provides excellent airflow between our back and the pack to keep us cooler and drier. Osprey included its Hydraulics LT 2.5L Reservoir to ensure that we can carry plenty of water on our ride with a bladder that fits perfectly into a dedicated hydration compartment. The U-zip main compartment opens into a large, internal organizational pocket with mesh compartments to store our tools, layer, snacks, and other gear. On the outside, we like the accessible hip belt pockets, the no-scratch sunglass pocket, the LidLock helmet attachment, and compression straps that can tighten down our load or carry a full face helmet.


  • Men's hydration pack for comfortable mountain biking
  • High-tenacity nylon is lightweight but highly durable
  • Eco-friendly durable water repellent sheds light moisture
  • 12L capacity travels light with a little extra room for gear
  • Airmesh wrap hip belt helps stabilize our load on rough trails
  • Attachment points for regular and full face helmets
  • Includes 2.5L Osprey Hydraulics reservoir
  • Item #OSPZ1HW
Responsible Collection
[nylon] bluesign®️ APPROVED, Recycled/Repurposed
400D recycled nylon, PFAS-free DWR coating
12L (732cu in)
Biostretch harness
Shoulder Straps
spacer mesh
Waist Belt
Hydration Compatible
Reservoir Included
Hydraulics LT 2.5L
front panel
1 zippered main, 2 zippered hip belt, 1 stretch front, 1 zippered top
Helmet Carry
upper straps
18.5 x 9.1 x 8.7in
mountain biking
Manufacturer Warranty

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