Coffee storage is essential for keeping your beans fresh so every cup is as good as the last. This coffee canister protects your beans from light and oxidation preserving the body and flavor of your beans for longer. This Bird Rock Coffee Airscape coffee canister has a plunger lid that removes and locks out air and humidity. The lid has a two-way valve pushes out excess air to preserve & protect freshness & flavor. The “swoosh” sound lets you know it’s working!