Riders looking for a low-profile lumbar pack with integrated hydration need look no further than the Seral 4. This slim waistpack features a 1.5-liter bladder with our 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. FEATURES: AirScape backpanel with contouring lumbar wrap provides maximum stability Included Osprey Hydraulics 1.5 L lumbar reservoir by Hydrapak Magnetic hipbelt bite valve attachment Large zippered main compartment with reservoir sleeve Main compartment tool organization and internal zippered pocket Blinker light attachment with reflective graphic