Stay hydrated while riding the trails with the SERAL Lumber Pack from Osprey. The AirScape backpanel and contouring lumbar wrap provide exceptional breathability and stability while riding the trails on your bike. The lumbar pack includes the Osprey Hydraulics 1.5L lumbar reservoir for long-lasting hydration. The magnetic hipbelt attachment keeps the valve close by and secure when you need to take a sip. The easily accessible zippered main compartment has a tool organizer for easy to keys, snacks and other essentials.