Give a warm welcome to Golmate new arrival-Hook Flask. The soft colors perfectly blend with a modern aesthetic. 2 ways to open. You can choose a press switch or a rotary switch. 4 sizes: 350ml, 500ml, 750ml, 1000ml. From children to adults, a wide range of choices satisfies all people's needs. 18/8 stainless steel: Golmate uses premium BPA-free stainless steel to prevent people from absorbing any toxicity. 24 hours for keeping cold and 6 hours for keeping hot. With a portable hook design, it’s a smart choice for traveling or other outdoor activities.