When vacuum packaging coffee in a Round Canister, place a coffee filter or napkin on top of the coffee before placing the lid on the canister. This will prevent the oil in the coffee (ground or beans) from being drawn up into the seal area and allow for a good seal every time. Loose tea stays fresher when vacuum packaged in a FoodSaver® bag after each use, and you can seal tea bags in your FoodSaver® canisters for ultimate freshness.