Abstract: A container includes a container body, a lid member, a first seal valve and a second non-return valve. The lid member is superimposable on the container body to form a storage chamber in the container, and defines therein a first opening and a second opening. The first seal valve is disposed on the lid member, normally seals the first opening of the lid member, and is operable to unseal the first opening of the lid member. The second, non-return valve is disposed in the second opening of the lid member to permit air to actively flow out of the storage chamber of the container body upon reaching a predetermined degree of pressure, and to prevent environmental air from being drawn into the storage chamber.