Fellow ATMOS Vacuum Canister, Glass, 0.7L While typical vacuum canisters trap air inside the lid to create pressure, this product uses a twist mechanism to release air from the canister, achieving superior preservation. It prevents oxidation of coffee beans and other items, keeping them fresh for longer. I used this to store coffee beans, but I'm selling it because I no longer need it. It functions perfectly, and the condition is clean. Since I stored coffee in it, the coffee aroma remains.