With its lightweight materials and reversible, double-duty design, the Arete 18 is one of the most versatile packs CamelBak makes-perfect for summit hikes, backpacking trips and travel. When you’re not wearing it, it transforms into an insulated reservoir sleeve-ideal for holding your water supply steady inside a larger pack. Ready for a quick hike? Just flip it inside out, and you’ve got room for snacks, layers, essentials, and 1.5 liters of water. Its lightweight materials and packable design also make it an excellent travel bag that won’t add bulk to your luggage. CamelBak updated this version of the Arete with additional pockets to keep your gear organized, along with a sternum strap and a lightweight back panel to give the bag a structured, comfortable fit.