There are a lo of good uses in the kitchen for mason jars. The most obvious being the preservation of food by using either a vacuum seal or a hot water bath. Other uses include storing dry ingredients such as rice and beans. You can buy gaskets for your mason jar plastic lids on Amazon. They create a tight seal so that no weavels or silverfish will get in the jar. Your food will stay fresh indefinately if you use these gaskets. I also like to layer or mix the dry ingredients for my homemade breads into these jars and seal them or refrigerate them. That way, I can mix up some bread in no time, with no fuss. It's good to set aside some time every now and then to keep these jars filled, so you will have them when you want them.