The Camelbak Delaney Race Lumbar Hydration Pack may be small, but the impact on your run is huge. A 24-ounce water bottle is the obvious part, but the ventilated back panel and an additional five-ounce pure energy flask are your secret to success. The mid-race hydration and final-stretch boost will propel you to the top of the podium or past your personal goals. It's even got a pocket for your keys, cash, and ID.