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Osprey Seral 4 Lumbar Pack

sku# 215536
Osprey - Seral 4 Lumbar PackOsprey - Seral 4 Lumbar PackOsprey - Seral 4 Lumbar PackOsprey - Seral 4 Lumbar PackOsprey - Seral 4 Lumbar Pack
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Product Info

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.

Product Details


Mainbluesign® approved 600D recycled PET polyester, PFC-free DWR

Accentbluesign® approved 400D high-tenacity nylon, PFC-free DWR

Bottombluesign® 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 BackpanelExtra thick ridged foam with center air channel for excellent ventilation.

Airmesh Wrap HipbeltAirmesh wrap hipbelt with zippered fabric pockets provide stability and breathability.

ErgoPull Waist Strap Closure SystemAllows for proper snug and stable fit.


  • Material: Recycled Nylon, Recycled Polyester
  • Biking Type: Mountain More 
  • Hydration Compatible: Yes
  • Bag Volume (L): 4
  • Warranty: Limited Lifetime

Other Notes

Osprey products can only be shipped within the United States and Canada



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