This water bottles flip-top lid is designed with a secure lock, which effectively preventing dust and leak-proof. It can be easily opened with one hand. Our sports water bottles for school has a silicone nozzle with a straw inside to prevent turbulent water flow. This water bottles is equipped with straw and a carry strap. And you also have a variety of colors to choose from. It's really a great gift for your families and friends as an excellent choice for fitness, gym, running, hiking, cycling, camping, and any other indoor or outdoor sports activities.