Changes in terrain demand flexibility. The Octane 18 sends you off with all the necessary bells and whistles-actual safety whistle included. Stay hydrated with a 2L Crux reservoir with Quicklink. Enough storage for snacks and essentials, and a convenient stretch overflow pocket for your top layers. Top load access for quick and easy stow on-the-go. Trekking pole attachment, dual adjust sternum straps for stability, and strategic 3D mesh venting for optimal air-flow while you move.