Crumbs
Product Images
Description
Hydrate Fast, Ride Light
The Osprey Seral 4 Bike Hydration Lumbar Pack is a compact, stable lumbar-style pack with an integrated low-profile Hydraulics™ LS 1.5L reservoir, so drinking while riding is easy without carrying a full backpack.
Bounce-Free Comfort
The AirScape™ backpanel pairs mesh-covered, extra-thick ridged foam with a center airflow channel for close-to-body carry, and it's made with 50% recycled EVA foam. A breathable airmesh wrap hipbelt adds stability on rough terrain, while the crossbody ErgoPull hipbelt system keeps the fit snug.
bluesign® PRODUCT
The Seral 4 meets bluesign® PRODUCT requirements, meaning its materials and components were selected to meet rigorous third-party environmental and social criteria during production.
Features:
- Main Compartment: Dual-zip access with glove-friendly zipper pulls
- Hydration Sleeve: Internal sleeve with hose routing ports and a Hydraclip for fast, effective reservoir hanging
- Magnetic Bite Valve Attachment: Secures the bite valve to the hipbelt
- Internal Organization: Zippered pocket with key clip
- Front Accessory Straps: Secure a chin guard or extra layer, and tuck away when not needed
- Side Compression Straps: Stabilize pack contents
- Blinker Light Attachment: Light not included
- Reflective Details: Added visibility for safety
Specs:
- Volume: 4L (244 cu in)
- Reservoir: Hydraulics™ LS 1.5L Lumbar Reservoir, included
- Dimensions: 6.7 x 11.4 x 5.9 in (17 x 29 x 15 cm), H x W x D
- Weight: 1.02 lbs (0.46 kg)
- Main Fabric: bluesign® approved, 100% recycled 300D polyester, DWR treatment made without PFAS
- Lining: bluesign® approved, 100% recycled 210D nylon, DWR treatment made without PFAS
- Mesh: bluesign® approved, 100% recycled polyester
- Fit: Unisex, one size
B-Stock - This product has one or more B-Stock units available. These units can be purchased at a discount (see option select). B-Stock units were returned from other customers and may have missing or damaged packaging materials. These units are otherwise as new. The full manufacturer warranty applies. Click Here for more information.
Specifications
Raven Black | Bag Capacity: 4L |
Color: Black | |
Mfg PartNum: 10007287 | |
Botswana Purple Dust Print | Mfg PartNum: 10007289 |
Bag Capacity: 4L | |
Color: Purple |

























