What is the little plastic inside a soda bottle called,and why is it in there?!

Question: What is the little plastic inside a soda bottle called,and why is it in there!?

also beer bottles have them in there too!. But they do not come out!. Why!?Www@FoodAQ@Com

Answers:

It helps keep the liquid from spilling out the top :)Www@FoodAQ@Com

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What is the little plastic inside a soda bottle called,and why is it in there?!

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