The Osprey Seral is a slim waistpack with a 1.5-liter bladder equipped with Osprey&';s updated high-strength magnetic coupling for improved hose management even in rough terrain. It has enough storage for ride essentials, like tools and snacks, while staying more streamlined than a bulky backpack. Constructed with high-quality bluesign-approved recycled high-tenacity nylon with a PFC-free DWR coating, the Seral 4 is sustainable and built to last. With its slim design and next-gen reservoir, the Osprey Seral 4 waist pack is for riders looking to hit the trail with low-profile, integrated hydration while keeping snacks and a spare close at hand. Features: PFAS-free durable water repellent (DWR) finish Includes an Osprey Hydraulics 1.5-liter lumbar reservoir with a strong, magnetic hip belt bite valve attachment. Large zippered main compartment with internal reservoir sleeve, tool organization and zippered pocket AirScape back panel with contouring lumbar wrap provides maximum stability Blinker light attachment with reflective graphic (light not included) Large zippered main compartment with reservoir sleeve and tool organization. Osprey Hydraulics 1.5L lumbar reservoir included; built with Hydrapak for premium quality and with a magnetic hip belt bite valve attachment. Internal zippered pocket tuck away your keys or other valuables here. Reflective graphic improves visibility in low light conditions AirScape lumbar backpanel extra thick ridged foam with a centre air channel for excellent ventilation and contouring lumbar wrap for maximum stability Airmesh wrap hip belt provides premium stability and breathability ErgoPull waist strap closure allows for a snug, stable fit.