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These packs add to our highly successful and innovative HydraulicsTM program. Utilizing our HydraFormTM reservoir, the Viper Series incorporates a streamlined feature set and simplified reservoir to pack interface.
The Viper 7 is an ideal size for everyday riding with internal organization features and a bungee lacing system on the front panel for carrying an extra clothing layer.
The Viper for men comes in a longer torso size for excellent fit. Great for recreational mountain bikers and even hiking, these packs offer sophisticated hands-free hydration at a sharp price point.

BioStretch™ Harness • Built-in magnet for quick bite-valve attachment
Spacer Mesh backpanel • Creates a lightweight, yet supportive and ventilated backpanel • Stretch sternum strap with magnetic hose attachment • Lightweight webbing
Detachable webbing hipbelt • Modified - Straight ErgoPull hipbelt closure
Viper Features
- LidLock™ helmet clip
- Carry jackets or other soft items on the outside of the pack using the front bungee compression system.
- Top Zippered Pocket for quick access
- Elastic Sternum Strap, with magnetic bite valve attachment
- Cell Phone / MP3 pocket on shoulder strap
- Blinker light attachment
- Reflective graphics
- 2L Hydaform Nagene Reservior included
- Osprey ALL MIGHTY Lifetime warranty
Viper specs:
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Weight: 500 grams
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capacity: 7L with 2L bladder
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Size Harness: one size fits all
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Material: 600D Poly, 210D double ripstop
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Dimensions Dimensions are shown as length (height) x width x depth 17 x 8 x 4 in 44 x 20 x 11 cm
HydraForm™ Reservoir Info
The reservoir design sandwiches an anatomically shaped molded plastic sheet between a layer of nylon fabric and the reservoir back. This forces the reservoir to conform to the back’s complex shape, even when full. The result is a more precise, stable and comfortable fit. Additionally, this reservoir has a rigid handle/spine that stabilizes the load of the water while also serving as a more convenient design to slide the reservoir into the pack
Features:
- Built to pharmaceutical biocompatibility specifications to assure taste and odor free hydration
- 180 degree on/off pivot bite valve with magnet
- Integral framesheet eliminates barreling
- Rigid Handle for easy insertion and removal in pack
- Wide mouth 80mm filler
- Large grab handle in front of bladder
- Contains AquaGuard™ anti-microbial formula to prevent bacteria and mold
- BPA and PVC free
bladder Specs:
Nalgene Tech info:
Q: Is it okay to put iodine tablets in my reservoir? A: Yes. For more thorough dissolution of the tablets, and for best mixing of the water you are trying to disinfect, it is recommended that you mix first in a bottle, then pour into your reservoir. Regardless of your approach, iodine is OK to use in your reservoir.
Q: What precisely is the "anti-microbial formula to prevent bacteria and mold"? A: Nalgene® reservoir film is treated with Aquaguard™. Aquaguard™ is the trade name for an FDA-approved anti-microbial which uses a silver and zinc composition to inhibit the growth of bacteria and mold, while offering carefree maintenance and odor control.
Nalgene® recently communicated the following information as it relates to Aquaguard™ :
“You may have heard recently that the Food and Drug Administration said new research raises "valid concerns" about the possible health effects of Triclosan, a chemical commonly used for its antibacterial properties in a wide range of consumer products.
Aquaguard™, the anti-microbial formula used in Nalgene reservoirs and hose assemblies, does not contain Triclosan, and never has.”
Q: What precisely is the material that is in contact with the water? A: FDA-approved EVA film with 1% antimicrobial
About Osprey

Since Osprey was founded in 1974, every single product design bearing the Osprey name has passed through the hands of owner and founder Mike Pfotenhauer, undergoing relentless scrutiny. From stitching the first lines of custom-fitted packs, to meticulously designing innovative products with intuitive features, to forging personal relationships with the sewing operators who construct the packs, Mike has been the unbreakable thread that makes Osprey a company like no other.
To celebrate its 35th anniversary in 2009, Osprey launched the All Mighty Guarantee, an enhancement of a lifetime warranty that was already one of the most robust in the industry. Free of charge, the company will repair any damage or defect in its product – whether it was purchased in 1974 or yesterday. If Osprey is unable to repair the item, it will happily replace it. The All Mighty Guarantee: any product, any reason, any era.
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