The Camelbak Marathoner Hydration Vest gives you hands free hydration making it ideal for marathon training and pushing your limits. Designed from the ground up to be the ideal hydration solution for long distance runners, the Marathoner has a bladder that can store up to 2 liters of water and the two harness pockets on the front can hold 24 ounce bottles. These same front pockets can also carry snacks, extra layers or any other item you might want to keep close at hand. The back of this Camelbak Hydration Vest has a second storage pocket that is great for carrying keys and other small essentials and reflectivity in the vest gives you higher visibility in low light hours. With a slight weight of only 12.7 oz. the Marathoner Vest feels great and has a natural fit that can be adjusted with the sternum belt so it feels perfect with no chafing. The Air Mesh back panel will provide you with plenty of ventilation and Camelbak even incorporated a safety whistle into this running hydration vest just in case you need to alert others. Push your limits while knowing you have plenty of hydration in the Camelbak Marathoner Hydration Vest.