Osprey Seral 4 Hydration Waist Pack
Ride light with this compact waist pack from Osprey. The low-profile Hydraulics™ LS 1.5-liter reservoir helps you stay hydrated. An AirScape™ back panel delivers bounce-free comfort.




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- Included Hydraulics™ LS 1.5-liter lumbar reservoir
- Bike-specific air-mesh wrap hipbelt and close-to-body AirScape™ back panel deliver breathable, bounce-free comfort
- Dual-zip access to main compartment with glove-friendly zipper pulls
- Internal hydration sleeve with hose routing ports and Hydraclip for fast, effective reservoir hanging
- Magnetic hipbelt bite valve attachment
- Internal organization and zippered pocket with key clip
- Dual vertical accessory straps can secure a chin guard or extra layer
- Side compression straps stabilize pack contents
- Blinker light attachment (light not included)
- Reflective details for visibility
Imported.
View all Osprey Cycling Hydration Waistpacks| Best Use | Cycling |
|---|---|
| Gear Capacity (L) | 4 liters |
| Gear Capacity (cu. in.) | 244 cubic inches |
| Reservoir Compatible | Yes |
| Reservoir Included | Yes |
| Bottle(s) Included | None |
| Liquid Capacity (fl. oz.) | 50.7 fluid ounces |
| Liquid Capacity (L) | 1.5 liters |
| Weight | 1 lb. 0.32 oz. |
| Fits Waist/Hips | 27-50 inches |
| Material(s) | bluesign®-approved, 100% recycled 300-denier polyester with a durable water repellent (DWR) treatment made without PFAS |
| Number of Exterior Pockets | 2 + main compartment |
| Bite Valve Shut-off Switch | Yes |
| Pack Access | Panel |
| Dimensions | 11.4 x 6.7 x 5.9 inches |
| Gender | Unisex |
| Sustainability | Contains recycled materials Product meets the bluesign® criteria |
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