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The material of the graduations on the carton is thinner. The juice inside can be observed from here. So you can tell how much juice is left in the carton. This carton is flexible. The creases on the surface can help you to fold the carton shorter easily while the juice inside is less and less. The shortened carton makes it easy to drink up the left juice without raising your head.
This flexible carton can not only tell how much juice is left but also save more space of the fridge when it is shortened.