The Hydrapak Bite Valve Sheath is a must-have accessory for any hydration pack user. This pack includes two bite valve sheaths, which are designed to protect the bite valve on your hydration pack from dirt and debris while you're out on the trail. These sheaths are made from a durable, flexible material that is easy to clean and maintain. Slide the sheath over the bite valve, and you'll enjoy fresh water throughout your entire adventure. Whether you're hitting the trails for a day hike or preparing for a multi-day backpacking trip, these bite valve sheaths are a must-have for maintaining the cleanliness and functionality of your hydration pack. So, get your Hydrapak Bite Valve Sheath (2-Pack) today and keep your hydration pack in top working order!