View stripe and ounce measurements on the side make it easy to know how much fluid remains. Unique lid features spill-proof, leak-proof valve. BPA free. Squeeze-to-drink function makes this a sanitary option- no hand or mouth contact with lid required! The Tesla 24 Oz. Bike Bottle is as innovative as its namesake inventor. A one-way valve is what makes this bottle so special as it allows a squeeze-to-drink function eliminating the need for hand or mouth to lid contact. Satisfying and sanitary! Not only is the lid touch free, the valve is also spill-proof and leak-proof. There is a view stripe on one side of the bottle along with ounce measurements for a quick way to know how much is still in the bottle. This functional bottle would be a fantastic addition to any sports store or athletic goodie bag.