The best way to store food in the freezer is in vacuum-sealed bags or containers—removing all the air prevents moisture loss and keeps food from getting icy. The next best choice is to tightly wrap with heavy-duty foil or freezer paper. To double-protect casseroles, press a piece of freezer paper on the surface of the food before wrapping in foil or freezer paper. (Remove freezer paper before baking.) Individually wrap items like salmon cakes before storing in an airtight container or freezer bag.