The ultimate freeride hydration pack! Lightweight, clean design, incorporating Source’s latest pack and hydration technology. Designed by pro riders. Holds up to 3L of Hydration - 20L of Cargo plus rain cover, helmet sling and many other practical features. - See more at: http://sourceoutdoor.com/en/hydration-packs/135-whistler-hydration-pack-biking.html#sthash.cf8XMzML.dpuf