Run like a professional with this VaporAir 2.0 7 Liter Men's Hydration Pack, voted #1 by Outside Magazine as the "Market’s Best Overall Hydration Vest." Fit is key to avoid chafing while you run so with our Adaptive-Fit™ adjustable sizing system you can have the perfect lightweight, body mapped pack. Store all of your essentials with multiple pockets and stay hydrated with the 2L bladder with quick release valve. When you are properly equipped, long runs will never be the same.