Ultrarunners and adventure racers will love the secure fit, freedom of movement, and comfort of the CamelBak Ultra LR Hydration Vest. Includes the 2 L Antidote Lumbar Reservoir BPA free. Antidote reservoir features quick seal cap, lightweight fill port, low profile design for unmatched stability, Big Bite valve, HydroGuard technology, PureFlow tube, and easy to clean wide mouth opening. Packs lower center of gravity means more stability, freedom of movement, and comfort over the long haul. Shoulder harness with dual sternum straps for stable and snug fit. Quick stash pocket for easy access on the move. Two front cargo pockets for easy access when on the go. Integrated safety whistle. Front and rear reflectivity for increased visibility in low light conditions.