Osprey Seral 4 Hydration Waistpack

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Size: One Size
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Looking for a low-profile waistpack with integrated hydration? Look no further than the Osprey Seral 4. It comes with a 1.5 L bladder to keep the H2O flowing while you tackle rough terrain.

  • Features

    • Has enough storage capacity for ride essentials, such as a spare tube, CO2 and multi-tool and snacks
    • Includes a 1.5 L Osprey Hydraulics lumbar reservoir by Hydrapak for on-the-go hydration
    • Magnetic hipbelt bite valve attachment keeps your hydration handy; updated magnetic coupling improves hose management, even in rough terrain
    • AirScape back panel with contouring lumbar wrap provides maximum stability
    • Large zippered main compartment with reservoir sleeve; main compartment features tool organization and internal zippered pocket
    • Constructed from high-tenacity nylon with a PFC-free durable water repellent (DWR) coating that sheds moisture and stains
    • Nylon is recycled
    • Blinker light attachment (light not included) with reflective graphic helps you stay seen in low-light conditions


    View all Osprey Cycling Hydration Waistpacks
  • Technical Specs

    Best Use

    Mountain Biking

    Gear Capacity (L)

    4 liters

    Gear Capacity (cu. in.)

    244 cubic inches

    Reservoir Compatible


    Reservoir Included


    Bottle(s) Included


    Liquid Capacity (fl. oz.)

    50 fluid ounce

    Liquid Capacity (L)

    1.5 liters


    15 ounces

    Fits Waist/Hips

    26-50 inches


    Recycled 600-denier PET polyester/recycled 400-denier high-tenacity nylon

    Bite Valve Shut-Off Switch



    12.5 x 7.5 x 4.5 inches



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