The CamelBak that’s not a backpack. Instead of a back pack hydration system, it’s a waistpack (don’t say fannypack!). The 2012 FlashFlo LR by CamelBak carries 1.5 liter of water. One of the best design features: as you drink water and the reservoir empties, the cinch system evenly distributes the water to keep the remaining water from sloshing around. Smart.