Using titanium as the metal material of the water cup is hard at first, so it is impossible to break it as a water container.
Secondly, the density of titanium is only slightly higher than that of aluminum, so it is lighter.
Third, titanium is the most stable metal we see in our daily life. Although titanium is an active metal, a dense oxide film will be formed on its surface. Some people put a piece of titanium in the sea for several years, but it still has a metallic luster. Therefore, when titanium is used as the metal material of the water cup, it will not rust for many years, and there will be no metal salt poisoning like that in aluminum pot.
At present, the evaluation of titanium cup before listing is that it is not easy to breed bacteria and will not have the characteristics of heavy metals.