The Osprey Viper 4 is the lightest of the Viper series, this pack provides a 2 liter HydraformTM reservoir, a heat embossed fabric pocket for carrying small items and a bungee lacing system on the front panel for securing an extra layer of clothing.  Good for a day of mountain biking, trail running, or day hiking! 

Size cu. in. liter lbs/oz kg.
One Size 250 4 0/15 0.43

Dimensions
Dimensions are shown as length (height) x width x depth
17 x 8 x 3.5 in
44 x 20 x 9 cm