The Osprey Seral 4 1.5L Hydration Pack is for riders looking for a low-profile lumbar pack with integrated hydration. This slim waistpack features a 1.5-litre bladder with Osprey\'s updated high-strength magnetic coupling for improved hose management even in rough terrain. The Seral 4 has enough storage capacity for ride essentials, such as a spare tube, CO2 and multi-tool and, of course, snacks. Constructed with high-quality bluesign®-approved recycled high-tenacity nylon with a PFC-free DWR coating.Osprey Seral 4 1.5L Hydration Pack FeaturesAirScape backpanel with contouring lumbar wrap provides maximum stabilityIncluded Osprey Hydraulics 1.5 L lumbar reservoir by HydrapakMagnetic hipbelt bite valve attachmentLarge zippered main compartment with reservoir sleeveMain compartment tool organization and internal zippered pocketBlinker light attachment with reflective graphic