Free coffee bag ALHOR COFFEE CANISTER gas repellent Set a save date Preserves the flavor high storage capacity Stainless steel Note: Made of high quality 304 stainless steel Suitable for trips and keeping coffee With a measure of the standard Coffee beans release carbon dioxide after baking, The cover is equipped with a one-way exhaust valve. Aft- erthe cover is closed, due to the internal Due to the diffe- rence of external air pressure, the one-way exhaust valve will automatically discharge the coffee in the tank Carbon dioxide produced by beans. At the same time,isolate the oxy gen and water outside the tank Water vapor prevents it from entering the tank, oxidizes the coffee beans and m- aintains The best state of coffee beans.