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Here is something read-worthy on the subject here >>> 

Vacuum sealing, or ROP (Reduced Oxygen Packaging) slows down the process of spoilage by reducing atmospheric oxygen, and creates an anaerobic environment that  limits the growth of aerobic bacteria or fungi, and prevents the evaporation of volatile components. Vacuum sealing is often used in combination with other packaging and food processing techniques.

As effective as this food storage source seems, it could put your health at risk. There are certain types of bacteria that prefer low oxygen environments and will grow on foods that have been vacuum sealed. Knowing the dangers these bacteria possess can help you avoid them and keep your food storage safe. MORE> http://readynutrition.com/resources/vacuum-sealing-can-be-hazardous-to-your-health_12022013/