Nuby - No-Spill Sport Sipper No matter what recreational activity your child is engaged in the No-Spill� Sport Sipper by N�by� is perfect for parents and children on the go! Why? Because N�by� developed the Sport Sipper with an innovative ergonomic shape with easy grips that ensures a comfortable and secure grasp for you child. Also included is the unique soft silicone spout with a built-in valve; it opens with sucking action and closes when not in use.