Mason jars are an iconic part of canning and preserving. They’re tied into the home gardening movement, which has been gaining a lot of momentum over the last few years. It makes sense that people are finding more uses for them than just preserving some fruit.
A mason jar can, among other things, be used to store one-person meals. They can also be used to store ingredients meant to be blended into a meal, like salads or cookies. These can be used as improvised lunchboxes, given as gifts, or just kept in the fridge for a day when you don’t feel like cooking.