The success of coffee packaging comes down to freshness. Our SGC1BM Matte Black Coffee Bag measures 80 x 60 x 260mm and holds 6-10 ounces (170-285 grams) of coffee, tea, and specialty food products. These bags are designed with one-way valves to capture that initial freshness and complexity of ground coffee and roasted beans. The one-way valve releases carbon dioxide, naturally emitted during the roasting process, while preventing the flow of external air from entering the bag. An aluminum barrier protects against moisture and air. Bags can be closed with a standard heat sealer or adhesive tin ties.