Avoid cleaning up messy spills and leaks! Kids are animated and active. even while holding (and occasionally dropping) their drinks. The Nuby Easy Grip Hard Spout Sippy Cup is here to help parents stop worrying about spills and leaks! The hard spout features a Vari-Flo valve that helps regulate fluid intake as children drink. As children sip on the spout. the valve opens and allows liquid through. When sipping ceases. the valve closes. ensuring a leak-resistant cup. The ergonomic shape features grips to ensure a comfortable. secure grasp for small hands. The included carabiner attachment makes it easy to attach the cup to bags or backpacks. Whether your little one is at home. in the car. or on the go. they can stay happy and hydrated without ever leaving behind their favorite cup!