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We have modified the water bottle by setting up a U-shape concave, which can be perceived whether it is screwed or not through touch. So there will not be any traces of water leakage, thus which can prevent the precious documents or electronic products from consequent damage. It can provide the stress point for fingers, increase friction resistance, and unscrew the cap easily.
Open concave, good finger radian, our design won't make the users feel sharp; free of dead angle, easy to clean, and unlikely to accumulate the dust, which make our design more humanized.