Fill up the CamelBak® Volt LR Hydration Pack for an afternoon of biking or hiking on the trails. Engineered for mountain biking and other trail activities, this lightweight CamelBak® Hydration Pack will keep you hydrated without weighing you down. The Volt's Antidote™ Lumbar Reservoir features a 100 oz. capacity and Big Bite™ valve for quenching your thirst. Its lumbar compression design enhances comfort and stability.