PEI_Jason wrote a review of CamelBak Hydrobak Hydration Pack on March 29, 2007
Nice product - compact. Perfect for biking or under your coat for spring skiing. 1.5L is just enough for me. Pouch can hold keys and a Clif bar. If you want to pack more stuff, upgrade to a larger pack with a waist strap. Only downfall is that it doesn't have a chest strap. Light pack - I like it.