Discount for each purchase food bag breaks through the the shackles of the traditional four bags, bags of straight edge into the curve edge, which reflects the different design style, is novel, simple and clear, good recognition, highlight the characteristics of the brand image. Main function is to oxygen, in order to avoid spoilage, the principle is relatively simple, due to food biodeterioration caused mainly by microbial activity, and the survival of most microorganisms such as fungi and yeast is the need of oxygen, and vacuum packaging bag is the use of this principle, the food packaging bags and food intracellular oxygen removed, the micro things lost "living environment".