For big sips on the go. This cap fits on all Yonder water bottles. 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. Rapid hydration for your workout.