Hydration Core 1.5If you are looking for a Lightweight, durable hydration solution to wear around your waist the Hydration Core will be just what you are looking for. Includes a 1. 5L HydraPak bladder and bite valve while a magnetic catcher that comes with the feed tube allows it to stay in place. 3. 0L of cargo storage will give you enough room for the essentials with extra pockets on the waist belt. AirLine back ventilation ensures sweat is kept to a minimum, there