With its lightweight materials and reversible double-duty design the Ar��te? 18 is one of the most versatile packs we make. When you're not wearing it it reverses into an insulated reservoir sleeve��perfect for holding your water supply steady inside a larger pack. Ready for a quick hike? Just flip it right side 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. We updated this version of the Ar��te with additional pockets to keep your gear organized along with a removable sternum strap.