I bought this protein shaker bottle to prevent my cat from hiding unnecessary pieces. What can be confirmed is that the top level is obviously not the focus of the design and R&D process. In other words, it will not open under moderate shaking, and I always put my fingers on the top of the lid. It cannot be said that its contents dissolve better than my protein shaker, nor can it be said that it is far superior, but the Shaker Bottle is convenient and can get the job done. The aesthetics are also pleasant.