This sound is not abnormal, since there is a vacuum dual layer wall that creates your bottle, there is a copper sheet in the vacuum for insulation purposes so when the bottle is shaken, it will create a light chiming sound.
This sound is not abnormal, since there is a vacuum dual layer wall that creates your bottle, there is a copper sheet in the vacuum for insulation purposes so when the bottle is shaken, it will create a light chiming sound.
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