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Plastic bottles start out usually about 2 or so inches around and approximately 8 inches. They are then heated in a machine wich softens the plastic then air is forced into the bottle leaving the endentation which was caued .

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14y ago
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14y ago

To make it crinkle and crush more to keep your pet dog entertained

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12y ago

easy to make and strong unlike glass witch can be broken or explodes in heat

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Q: Why do plastic bottles have an indent in the bottom?
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