The Camelbak Big Bite Valve Cover provides a secure, hygienic fit that protects your bite valve from debris and contaminants. This cover is easy to install and helps keep your hydration system clean and safe, while delivering a 100% leak-proof seal. Camelbak Big Bite Valve Cover is designed to secure tightly to both Camelbak valves and traditional straws - allowing it to be used for a variety of activities. Its unique design makes it easy to use: just twist off and bite down with your teeth for a leak-proof seal. The valve cover is also highly durable and removable for easy cleaning.