Stow and go with Pak Cap. Store snacks, vitamins, or any other small essentials in the top half of the twist-to-open cap. ​​​​​​​ The CamelBak Pak Cap Accessory is a must-have for any outdoor enthusiast. With its reliable, leak-proof design and easy to use flip-top opening, you'll be sure to stay hydrated wherever your next adventure takes you. The Pak Cap Accessory fits all CamelBak Pak reservoirs and is the perfect way to keep your water cool and secure during long hikes and outdoor activities. Its BPA-free construction also ensures that your water is safe to drink. Whether you're a frequent hiker, cyclist, or camper, the CamelBak Pak Cap Accessory is the perfect companion to keep you hydrated and safe on your next outdoor adventure!