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In order to prevent straw fell into the bottom plus hollow design relying on buoyancy prevent straw sink even if put lid on next time open it will float again.
Many girls drink water with a straw but straw not long enough fell into the bottom subjoin structure like Swimming laps make it float can also be withhold bottle.
Southern Taiwan University of Science and Technology
Tainan, Taiwan
Southern Taiwan University of Science and Technology
Tainan, Taiwan