When you’re squeezing in a quick ride after work, Osprey’s Viper 3 is the perfect size. The suspension is designed for moving light and fast: A foam framesheet spreads weight across a ventilated mesh backpanel for lightweight comfort. The BioStretch™ shoulder harness provides a contoured fit and the webbing hipbelt is removable to shave ounces. If you end up carrying extra weight, top compression straps lend extra load stability.
Access gear in the main compartment via a zippered front panel. You can slip small items into the harness pocket or stash a layer in the front fabric shove-it pocket for quick access.
Bike-friendly features include a Hydraulics™ LT 2.5 liter reservoir with magnetic bite valve retention, internal bike pump storage loops, and Osprey’s innovative LidLock™ helmet attachment system.
I got this pack last year and I love it. It says its for cycling, but I use it mostly for spring skiing and day hiking. As long as you don't need to carry anything except for water and your keys, this pack is perfect. It's extremely comfortable, adjustable, and light. I love the design of the water reservoir and how well it fits in the pack.
Park City, UT
Like the pack - hate the bladder
Pack itself is great. Nice size. Nice fit. Disappointed in the bladder. Expected it to be like my Hydrapak bladder in that it's easy to flip inside out to dry. Can't do it on this bladder. The neck is too small and it has rigid parts.