What’s the purpose of vaccum packing?

Vacuum sealing protects food from dehydration and freezer burn. Freezer burn occurs when water gets into your food. The vacuum bag keeps your food from contact with the air, so moisture cannot evaporate, making it an excellent barrier from the elements. At its very foundation, vacuum sealing is the act of removing oxygen from bags or containers, creating an airtight seal that protects food from freezer burn and bacteria growth.