8 oz Coffee Bags with valve is made of food-safe plastic and aluminum foil fused protective lining. Preserve the freshness of your contents with a degassing valve to keep gases and moisture out of the bag. Impulse sealer sealable flaps with tear notch for lengthy storage. Made of food-safe plastic and aluminum foil-fused protective inner lining. This bag provides both an excellent moisture barrier and high resistance to puncture and tear.