Meet the Nathan Pinnacle Soft Flask 18 ounce, your hydration wingman that shrinks as you sip! The ergonomic mesh strap hugs your hand for a hands-free feel, and the clever 3-D collapsible design means less bulk as you go. Tuck essentials like keys or snacks in the wrap-around pocket, and enjoy the stable, comfy grip provided by the ExoSpine™. Ready to hydrate, collapse, and keep pace, just like you.