Own the trails with this iconic, ergonomic, ultralight pack. Whether you’re a runner or ultralight fastpacker, you’ll appreciate the minimalistic, efficient design of the HPL O2O hydration pack. Nathan’s patented three-way propulsion harness keeps the pack’s load centered on your back even as you run or scramble through difficult terrain. In addition to the two-liter hydration bladder, the O2O can also hold up to a 22oz water bottle on the front strap. With up to six liters of storage capacity you’ll have plenty of room to carry everything you’ll need on the trail, in addition to secure pockets and pouches for your phone, wallet, ID, keys and more. Weighing under a pound, this pack gives you everything you need, and nothing you don’t.