CamelBak Women's Aurora Cycling Hydration Backpack Just The Right Size For Essential Gear & Hydration For 2 Hours In The Saddle 3 Liter Storage Capacity, Plus 2 Liter Antidote Reservoir With External Fill For Convenience AC Back Panel With Air Channels Provide Increased Air Flow To Keep Your Back Cool Features Air Mesh Harness, Reflective Back Strips, Overflow Storage & Bike Tool Organiser Pocket Stretch Elastic Side Panels & Dual Compression Straps; Available In 2 Colours