1.5L Hydration and 3.0L Cargo Waist belt pockets Low gravity horizontal waist bladder Reflective safety piping ULTRA-LIGHTWEIGHT LOW GRAVITY WAIST FIT.If 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, there is also a magnetic catcher that comes with the feed tube, so it stays 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 are even 2 foldable bottle mesh compartments, and one size fits all!If you are looking for larger tool capacity take a look at the Core 2.0 tool belt.