Canning Canning is a great way to preserve and store foods for long periods of time. Specially designed canning jars are made to preserve foods such as jams, sauces, salsas, fruits, vegetables and more so you can enjoy your favorites all year long, even when they aren't in season. Canning labels help you clearly mark which foods and which so there is no mix ups later on. Jar lids secure on tightly, working to keep your food fresh for whenever you choose to eat it. Many canning lids provide a space for expansion above the jar so food has space to expand and stay well–preserved. You can now enjoy your favorite sauce or jam whenever you want it after you make it just once.