Osprey Seral 4 Hydration Pack Hydrate fast and ride light with this compact, stable lumbar-style bike pack featuring an integrated low-profile Hydraulics™ 1.5L LS Reservoir. A magnetic attachment secures the bite valve to the hipbelt, while a bike-specific airmesh wrap hipbelt and close-to-body AirScape™ backpanel deliver breathable, bounce-free comfort. Vertical straps hold a chin guard or extra layer for added versatility. Features: Dual-zip access to main compartment with glove-friendly zipper pulls Included Hydraulics LS 1.5 L Lumbar Reservoir 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 Front accessory straps secure a chinguard or extra layer, and tuck away when not needed Side compression straps stabilize pack contents Blinker light attachment (light not included) Reflective details for safety Key Attributes: Reservoir Included - Drinking while riding has never been easier with the included Hydraulics™ LS Lumbar 1.5 Reservoir, smart hose routing and a magnetic bite valve attachment. Rider-Focused Features - Enhance every ride with stabilizing side compression, dual tuckaway front accessory straps designed to secure a chin guard or extra layer, and more. AirScape™ Backpanel - Pedal with the comfort and stability of a mesh-covered, extra-thick ridged foam backpanel featuring a center airflow channel. bluesign® PRODUCT - This product meets bluesign® PRODUCT requirements, which means materials and components have been selected that adhere to rigorous third-party environmental and social criteria during production. AirScape™ Backpanel - Mesh-covered, extra-thick ridged foam with center airflow channel provides comfortable, stable, close-to-body carry Made with 50% recycled EVA foam Hipbelt - Breathable airmesh wrap hipbelt provides stability on rough terrain Crossbody ErgoPull hipbelt system ensures snug fit for optimal load support Specifications:  One/Size VOLUME 244 IN 3 / 4 L DIMENSIONS 6.7H X 11.4W X 5.9D IN - 17H X 29W X 15D CM WEIGHT 1.02 LBS. - 0.46KG FABRIC: MAIN - bluesign® APPROVED, 100% recycled 300D polyester, DWR treatment made without PFAS LINING - bluesign® APPROVED, 100% recycled 210D nylon, DWR treatment made without PFAS MESH - Backpanel & Hipbelt Mesh: bluesign® APPROVED, 100% recycled polyester WARNING: This product can expose you to chemicals including dimethylformamide, which is known to the State of California to cause cancer. For more information, go to oehha.ca.gov/proposition-65/about-proposition-65 Your browser does not support our video.