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Interestig water bottle / water bottle

Interestig water bottle

When you buy bottled water in store,you will use one hand to drink water, and the other hand to hold the bottle cap. But it is not too convenient when you're at the gym,using the phone, doing soort etc. so how can you free one of you hand, and allow it to do the other matter?

University

Guangdong University of Technology

Guangdong University of Technology
GuangZhou, China