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When the milk left, we fold milk carton and store in the refrigerator.
It is detriment for freshness of the milk to be exposed to the air.
In order to prevent this, people made a milk carton with zipper to maintain freshness of the milk
Kyung -sung university
Busan, South Korea
yoonhye kim,
Kyung -sung university
Jeong yeon joo,
Kyung -sung university
Park eun young,
Kyung -sung university
Lee jeong ju,
Kyung -sung university
