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Do you usually find that you can not eat up the food when you open a bag ? Do you find the food become not fresh soon after you open it ? This clip ,simple but practical , not only can keep food in a closed bag without air exchange as it used to , but also can take out part of air with the framework , which bases on the inflator but have an opposite function . When you put in the shank , the air in the bag fluent out around the circle . When you pull out the shank , the air outside can not go into the inside . So the food in the bag can keep fresh for a longer time and without be dried or wetted by the air outside.