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Item # OSP1G242M

Osprey Seral 4 (2023) Hydration Lumbar Pack

Purchase Seral 4 (2023)

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You need to stay hydrated when you're cranking pedals all day long, but that doesn't mean you want to slow down or carry a bulky pack to catch a drink. The Osprey Seral 4 lumbar pack has its own integrated reservoir so you can just keep on riding.


  • Minimalist lumbar design provides unencumbered mobility: The streamlined design of the Seral is ideal for riders who prefer an off-the-back hydration carry.
  • Purpose-built to deliver riding stability: A bike-specific, angled hipbelt with built-in compression straps stabilizes weight and enhances comfort by keeping the pack close to your body.
  • Built-in premium hydration performance: The pack includes a BPA-free Hydraulics LT 1.5L Lumbar reservoir that compresses for a stable carry with a drinking hose and a magnetic bite valve to keep water at the ready and in easy reach.
  • Sustainable construction that doesn't compromise on functionality or durability: Tested to ensure that they meet Osprey's demanding technical requirements, the pack's main body fabrics are GRS-certified recycled and bluesign-approved and the protective durable water-repellent treatment is PFAS-free.

Check out all of these other special 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

California residents: view proposition 65  Warning

Technical Specs

Best Use
Hiking, Cycling
Panel loading
Item Dimensions
7.5" x 12.5" x 4.5"
Frame Material
Ridged foam
Hydration Compatible
Yes; Hydraulics LT 1.5 L lumbar reservoir included
244 cu in
Limited Lifetime
Hydration Lumbar Pack
Main: bluesign approved 600D PET packcloth, DWR treatments made without PFAS
Bottom: bluesign approved 100% recycled 400D high-tenacity nylon, DWR treatments made without PFAS
Item Weight
0.93 lbs

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