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With 4 liters of carrying capacity, the Osprey Seral 4 Lumbar Pack is the optimal size for the vast majority of mountain bike rides. Equipped with a 1.5L hydration reservoir, a big zippered main compartment with internal organization for bike tools, and Osprey's beloved AirScape lumbar backpanel for ergonomic comfort and ventilation, the Seral 4 Lumbar Pack is just what you need to focus more on the trail and less on combating sweaty back syndrome.
Main – bluesign® approved 600D recycled PET polyester, PFC-free DWR
Accent – bluesign® approved 400D high-tenacity nylon, PFC-free DWR
Bottom – bluesign® approved 400D recycled high-tenacity nylon, PFC-free DWR
7.5" H x 12.5" W x 4.5" D
Large Zippered Main Compartment with Reservoir Sleeve
Main Compartment Tool Organization
Internal Zippered Pocket
Blinker Light Attachment with Reflective Graphic
Magnetic Hipbelt Bite Valve Attachment
Included Osprey Hydraulics 1.5L Lumbar Reservoir by Hydrapak
AirScape Lumbar Backpanel – Extra thick ridged foam with center air channel for excellent ventilation.
Airmesh Wrap Hipbelt – Airmesh wrap hipbelt with zippered fabric pockets provide stability and breathability.
ErgoPull Waist Strap Closure System – Allows for proper snug and stable fit.