RAPID HYDRATION FOR YOUR WORKOUT. The Yonder™ Straw Cap provides controlled drinking and quick access to hit your hydration goals. Flip up the straw| take a swig| and push it down for a leak resistant seal every time| so you can get back to your next set. The wide straw also quenches maximum thirst so even the shortest sips get the job done. Do not use this Yonder™ Straw Cap with hot| or carbonated beverages or use as storage for food or perishables.