Coffee bags are packaging containers specifically designed for coffee beans/ground coffee, with the core objectives of preserving freshness and preventing oxidation, releasing the continuous carbon dioxide produced after roasting, protecting against light and moisture, and facilitating retail and transportation; packaging is a crucial aspect in determining the retention of flavor. Roasted beans will continuously release CO₂, and without an exhaust design, the bag body is prone to bulging or even bursting; at the same time, it is necessary to prevent the intrusion of oxygen, moisture, and light to avoid the oxidation of coffee oils and the loss of aroma.