New Balance 2L Hydro Running Backpack has a combination of lightweight & breathable material that will help you go those extra mile. The backpack not only feature quick & easy access to water for hydration, it also features ample of storage spaces for your essential items to help you on your way. Easy adjustable straps provide secure & individual fit. While the shoulder straps are made from mesh, meaning when you exercise & sweat, those sweaty unwanted moisture will evaporate quicker than usual making your running adventure much more enjoyable.