There are a million and one things you can do with a mason jar! One of my favorite things to do is to prep meals with them! You can make different layers my favorite is to do this with salads! There are not too many ways that I know of that you can pre make salads without them getting all disgusting and wilted, but the Mason jar is perfect for this! You simply put the dressing on the very bottom and then layer each ingredient in the appropriate order. For example I like to do the dressing always first and then I do the hardest ingredients like carrots and broccoli, then I'll do things like chickpeas flax seeds and then lettuce and on the top I put my softer Foods like cheese, hard boiled egg, and chicken or tuna fish. You can make them like 5 days in advance for example I used to make 5 jars and bring one to work with me everyday when I would shake them up everything would be completely fresh and delicious! You can also do this with other things like yogurts, with fruit and granola or cottage cheese with fruit on top if you have the smaller jars. Anything that you can think of that sounds appealing to you this will work for!