Vacuum packing foods mas many advantages. It prevents the growth of microorganisms that cause spoilage and this can extend shelf live up to five times which means pre-prepared foods can be stored for several days without affecting the quality and this can lead to an increase in kitchen efficiency as well as lowering waste. Should you want to freeze the contents, the lack of air in the bag prevents freezer burn. The bags are designed for use with one of the Turbovac machines sold under codes AN820 and AN821.