CamelBak Hydrobak Cycling Hydration Backpack When You Need More Water Than Bottles Can Hold, This Is Your No-Frills, Hands-Free Solution 1.5 Liter Antidote Reservoir To Keep You Hydrated For 1.5 Hours With External Fill For Convenience Air Mesh Back Panel Designed To Keep Your Back Ventilated, With Shorter Pack Length For Comfort Features Lightweight Mesh Harness For Comfort And Small Zip Pocket For Storing Essentials Reflective Back Strip Included To Make The Wearer More Visible At Night; Available In 4 Colours