An ultra-light, lumbar reservoir-based mountain bike pack that repositions the water weight on your hips for maximum stability and comfort.Reservoir Features:Antidote Lumbar Reservoir with 1/4 turn - easy open/close cap, lightweight fillport, patented Big Bite Valve, HydroGuard technology, PureFlow tube, easy-to-clean wide-mouth openingKey Pack Features:Ultra-light materials, lumbar reservoir compression, bike tool organizer pocket, stretch overflow storageDesigned to Carry:Multi-tool, CO2 pump & cartridges, spare tube, extra layer, energy supplements, phone, wallet, keys