Camelbak Ergo Hydrolock™ suits all Antidote™ reservoirs as well as the Camelbak reservoirs before it. A ribbed connection provides a secure fit onto the Camelbak tube and a smooth connection facilitates the Camelbak Big Bite™ Valve. Durable construction with a simple one-handed shut off switch, the Ergo Hydrolock™ is a genuine replacement to keep your Camelbak hydration reservoir in order.