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By using flexible material in the middle of it, the bottle can be bended and extended easily. In terms of the bottle's bottom.a big-end-up seam is designed. Such a seam ensures that these water bottles can be easily connected one by one. After using the water bottles,we can change then into a buoy. This way is convenient which at the same time reduces the materials of making a buoy.
Ningbo Institute of Technology,
Ningbo Institute of Technology
Yufan Wang Fuyi Jin Yuhao Chen Qingchuan Feng