KEEP IT FRESH – 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 FOOD SAFE MATERIAL – Natural White Kraft Paper + Aluminum foil fused protective inner lining + LLDPE DURABILITY – A heavy-duty bag that provides both an excellent moisture barrier and high resistance to puncture and tear with it 6 milliliters thickness NICE SHAPE: Flat Bottom Box Pouch Bag with Air Release Valve and Zipper. (One Way Degassing Valve, Resealable zipper, Flat Bottom for better Shape) VARIOUS SIZES: 4 Sizes Bags: 4oz, 0.25lb; 8oz, 0.5lb, 16oz, 1lb, 35oz, 2.2lb. (Note: Must seal the top after putting ground Coffee using Impulse Sealer)