Just buy the kambukka tumbler, a well-known European water cup brand. The three-in-one button function of this cup is very practical, because it can switch the drinking mode with one button, and you can take small sips or open it. You can drink by mouth, lock the cup and take it with you. You can easily switch how you want to drink water at any time. There is no need to worry about which water cup to buy. One cup can meet all your needs. This cup is also very light, making it easy to carry around when exercising.