Airscape® technology features a patented plunger lid designed to fit snugly against the inside of the canister. As the Airscape® lid is pressed down, the oxygen is forced out through a two-way valve. Once the plunger is directly above the contents, flip the handle down to prevent further oxygen exchange & dramatically increase the shelf life of your coffee. Small holds 250g Coffee | Height 10.5cm x Diameter 13cm