What is the best way to save latex paint?

Try to buy paint in plastic containers and buy the neat plastic inserts that the home centers sell to place inside the can right down on the surface of the paint. If the lid of the container is made of tin place some plastic film over the top of the container before putting the lid on, this will help to keep any rust that might form from falling into the container when it is opened next time.What is the best way to save latex paint?
cut a garbage bag the same size as the bucket lid and insert it on top of the paint gingelry and place the cover on and store in a cool dry place