The camelbak octane dart hydration running backpack is a great choice for those who want a minimalist design and maximum comfort while running or walking and ensures hands free hydration and 20 more water per sip thanks to the included crux reservoir the reservoir has a capacity of 15l 507oz and features an ergonomic handle for easy refilling as well as an onoff lever which helps to prevent leaks the backpack offers 2 zipped pockets and a stretchy pocket on the harness for gels and bars