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Reply To: Why are some bags of dog food "shrink wrapped"?

January 13, 2014 at 9:27 pm #32180 Report Abuse
theBCnut
Member

Vacuum packed is better because the oxygen in air starts the process of degrading some of the ingredients in the food. How airless they are has to do with how warm the food was when the bag was sealed. When the food cools, the air contracts, pulling the wrap even tighter.