Breathe in. Breathe out. Hike with the breathable Stratos/Sirrus™ Packed with technical features that complement any hike and adventure, including an updated AirSpeed™ suspension that delivers a supremely enjoyable, wraparound fit while keeping you cool and comfortable. A LightWire frame tensions the mesh backpanel, keeping your pack — and its contents — away from your back for a lively, airy carry. Fully featured for exploration, from the rugged backcountry to national park scenic trails, you can't go wrong. Each pack features internal hydration storage, hipbelt and stash pockets, Stow-on-the-Go trekking pole attachments and more, while different volumes provide more specialized attributes depending on your journey ahead.