Hydrate fast and ride light with this compact, stable lumbar-style bike pack featuring an integrated low-profile Hydraulics (TM) 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 (TM) backpanel deliver breathable, bounce-free comfort. Vertical straps hold a chin guard or extra layer for added versatility. Osprey Seral 4 Bike Hydration Lumbar Pack | Multi Purple | Christy Sports