That sounds like a great idea. Do you find that when the jar cools down, that the lid seals tight, and therefore the soup will last longer in the fridge as compared to just using some plastic wares with a lid?
We make all kinds of soup on our cold winter months. Nothing better than a hot bowl of soup after I come in from snow blowing out the driveway. Warms me up fast.
Anyways, we have been putting our soup in plastic containers, labeling them, and putting them out in the freezer until we want to use them. I don't like to leave soup in the fridge for more than a few days, but maybe your soup canning method in jars would keep the soup fresher, longer?
FWIW, we reuse the plastic containers from the 9 oz. Honey Ham we get at WalMart....
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Those containers are just about the perfect size for leftovers for me and Dear Wife. Not too much food in each container with only 9 oz size. The food goes pretty fast in those small containers and does not go bad sitting in the fridge. Just about the perfect size for two big bowls of soup. Makes it easy for meal planning in the sense we can just take one of those plastic containers from the freezer and know it's just enough for a meal for the two of us.
Eventually, they will crack or break, usually on the lid. But we manage to get maybe a year's worth of reuse on them before then. They don't take up much storage space in the cupboard because they nest into each other. We currently have a stack about 15 high and it does not take much room at all. It's also good to reuse and/or repurpose those containers instead of immediately sending them to the landfill.