[post_page_title]A micro-puncture[/post_page_title]
Hardwick was told that the reason for the growth inside his daughter’s pouch of Capri Sun was caused by a micro-puncture. That was why the pouch felt so flat to begin with, and it had been ever so slowly exposing what was inside to the outside elements.
While they are sealed shut to keep fresh ingredients from going off, when air is introduced to that environment mold can grow, and the ingredients can go off. The contents of the pouch were essentially fermenting inside.