Most bottle caps are difficult to open, especially for old people and children that with less strength; It's also difficult to open when the bottle body is covered with water, such as some cold drinks in summer.
In order to solve this issue, we redesign the cap to make a square top and keep the round bottom.
People will use less strength to open the drinks easily.
In addition, the top surface of the cap is designed to raise slightly, which creates a playful interaction between people and the cap.
