The Body Bottle neatly fits in any of Ultimate Direction's Vests, Vesta Hydration Packs, or Belts, allowing you to quickly gulp down precious H20 while racing and training outdoors. New for this year, the 500-millilter Body Bottle now comes with a fully locking bite valve, ensuring it doesn't dribble or drip while you're jostling it around on the trail or road. It collapses to an ultra-compact size when it's empty, allowing you to compactly store it in your hydration vest or backpack. Additionally, it's entirely free of BPA, so you can drink to your heart's content without worrying about ingesting potentially harmful chemicals.