For hard ascents and fun descents.
Push your downhill bike to the top of mountains with your helmet, hydration reservoir, pump, and more in Osprey''s Viper 13 Hydration Pack. Its included Hydraulics LT 2.5L reservoir gives you much-needed water without stopping the ascent, and the LidLock system secures your helmet so it doesn''t tumble down the hill once you reach the top. Osprey made this pack with well-ventilated Airscape and BioStretch mesh, and the back panel has an Atlion foam framesheet to enhance stability without interfering your mobility down the mountain.

Airscape back panel
BioStretch shoulder straps
Removable webbing waist belt
Hydraulics LT 2.5L reservoir included
LidLock helmet attachment system
Front and side stash pockets
Zippered shoulder strap pocket
Upper and lower side compression straps
Item #OSP005M

Material[main] 210D polyester, [accent, bottom] 420D nylon packcloth
Volume13L (793cu in)
Support/SuspensionAirscape back panel, Atilon foam
Shoulder StrapsBioStretch
Waist Beltyes, removable
Hydration Compatibleyes
Reservoir Includedyes, 2.5L Hydraulics LT
Accessfront panel
Pockets1 zippered stash, 1 shove-it, 1 shoulder strap, 2 mesh side, 1 front stash
Helmet Carryyes, LidLock
Compressionyes, side straps
Dimensions18 x 9 x 9 in
Claimed Weight1 lb 5 oz
Recommended Usemountain biking
Manufacturer Warrantylifetime