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The Osprey Sylva 12 Hydration Pack is a lightweight daypack that carries the essentials and provides hands-free hydration while mountain biking. An AirSpeed™ 3D tensioned mesh backpanel helps keep your back cool on the ride, and the shoulder straps are designed with a curve that contours to your body as you reach for the handlebars. The included 2.5L Hydraulics® LT bladder lives in its own compartment, providing easy access for quick fill-ups. Side compression straps and a low-profile waistbelt enhance stability, the stretch mesh pocket on the front is great for stashing layers, and the integrated raincover really comes in handy if you get caught in a shower.
FEATURES of the Osprey Sylva 12 Hydration Pack
- Front stretch mesh pocket
- Scratch-free heat-embossed zippered slash pocket
- LidLock helmet carry
- Blinker light attachment
- Integrated removable high-visibility raincover
- Magnetic sternum strap for quick access to reservoir bite valve
- Zippered tool organization pocket
- Dedicated reservoir compartment with Hydraulics LT 2.5L Reservoir included
- Peripheral LightWire frame creates a platform for a contoured tensioned mesh backpanel
- 3D-tensioned breathable mesh backpanel provides extreme ventilation with a comfortable fit
- New bike-specific shoulder strap shape provides comfort and stability
- Soft breathable spacermesh contact surfaces and die-cut foam ventilation
- Padded spacermesh hipwings with webbing ErgoPull waist strap provides comfort and stability
- Airmesh wrap hipbelt with zippered pockets provide stability and breathability
- Dual stretch mesh side pockets
- Dual upper and lower side compression straps
Fabric Details
- Main: 100D Nylon Honeycomb
Osprey Women’s Backpacks
| PACK SIZE | One Size | X-Small | X-Small / Small | Small | Small / Medium | Medium | Medium / Large | Large |
| Archeon 30 | 14 – 19″ | – | – | – | – | – | – | – |
| Archeon 45, Archeon 65 | – | – | 13 – 17″ | – | – | – | 16 – 20″ | – |
| Ariel, Ariel Plus | – | – | 13 – 17″ | – | – | – | 16 – 20″ | – |
| Ariel AG, Ariel Pro | – | 14 – 17″ | – | 16 – 19″ | – | 18 – 21″ | – | 20 – 22″ |
| Aura AG | – | 14 – 17″ | – | 16 – 19″ | – | 18 – 21″ | – | – |
| Eja | – | 14 – 17″ | – | 16 – 19″ | – | 18 – 21″ | – | – |
| Fairview Travel Pack | – | – | 13 – 17″ | – | 16 – 20″ | – | – | – |
| Kresta 14 | 15 – 19″ | – | – | – | – | – | – | – |
| Kresta 20, 30, 40 | – | – | 13 – 17″ | – | 16 – 20″ | – | – | – |
| Kyte | – | – | 13 – 17″ | – | 16 – 20″ | – | – | – |
| Lumina | – | 14 – 17″ | – | 16 – 19″ | – | 18 – 21″ | – | – |
| Renn | 14 – 19″ | – | – | – | – | – | – | – |
| Sirrus | – | – | 13 – 17″ | – | 16 – 20″ | – | – | – |
| Sopris | 14 – 19″ | – | – | – | – | – | – | – |
| Tempest, Tempest Pro | – | – | 13 – 17″ | – | – | – | 16 – 20″ | – |
| Viva | 14 – 19″ | – | – | – | – | – | – | – |
| Xena | – | 14 – 17″ | – | 16 – 19″ | – | 18 – 21″ | – | – |
Please note that the info provided above refers to the torso size the pack will fit, and NOT any dimensions of the pack. Below are steps for how to get your torso length. You should have someone help take this measurement for you so it is accurate.
HOW to MEASURE TORSO LENGTH:
1. Start at the iliac crest, which is the top of the hipbones on the side of your body. These act like a shelf for supporting a pack hipbelt.
2. Touch your chin to your chest to find the C7 vertebrae, the knobby bone at the base of your neck.
3. Make sure you keep your back as straight as possible while measuring.
4. Measure the full length from the C7 vertebrae to the iliac crest. This torso measurement determines what size Osprey pack you should carry. Refer to the size chart above to find your ideal size.
5. If you are in between sizes, it is ideal to try them both on before ordering.



































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