The Osprey Seral lumbar pack is perfect for the minimalist looking for something other than a traditional over-the-shoulder pack. The Seral features a dedicated hydration compartment that stores an included 1.5L lumbar reservoir and compresses for stable carry. Dedicated hose magnet attaches the bite valve for easy access.Easily accessible zippered main compartment with internal tool organizationDual zippered hip belt pocketsFront panel bungee carries extra clothingDirect access zip path to reservoir compartmentMagnetic hip belt bite valve attachmentHydraulics 1.5L Lumbar Reservoir includedExtra thick ridged foam with center air channel for excellent ventilationAirmesh wrap hip belt with zippered fabric pockets provide stability and breathabilityErgoPull waist strap closure system allows for proper, snug and stable fit