Osprey  Seral 4 Hydration Waist Pack

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Looking for a low-profile waist pack with integrated hydration? Look no further than the Osprey Seral 4. It comes with a 1.5-liter reservoir to keep the H2O flowing while you tackle rough terrain.

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  • Waist pack 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
  • Closeout


View all Osprey Cycling Hydration Waistpacks

Technical Specs

Item #221616
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 ounces

Liquid Capacity (L)

1.5 liters


15 ounces

Fits Waist/Hips

26-50 inches


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

Bite Valve Shut-off Switch



12.5 x 7.5 x 4.5 inches




Contains recycled materials

21 reviews with an average rating of 4.0 out of 5 stars

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