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Taking a drink is easy, but getting the cap off often is not. The problem comes from not being able to find a point of exertion on a round cap, especially when your palm is sweating from fighting the bottle.
Twist the mind a bit, and the Penta-off is born! With this pentagon cap, twisting the cap off is as easy as jumping on a bike. Drinking up, of course, is never a problem.
Ming Chi University of Technology
Department of Industrial Design
Taoyuan City, Taiwan
Shing-Shiang,Fang Wei-Chen Hsu