The Salomon S/Lab Ultra 12 Set Pack is purpose-built for ultra runs, carrying everything you need on the trail. SensiFIT™ technology that stretches and breathes with your body. These features make the vest remain comfy mile after mile. 12 litres of storage in strategically placed pockets can carry your running essentials. Two 500ml soft flasks are included to keep you hydrated. These flasks store in bounce-free pockets, preventing unwanted motion from your hydration.