Hello, I'm an expert in home kitchen practices and food preservation. When it comes to storing items in the freezer, it's important to consider the material and the purpose of the item you're freezing.

Mason jars are a popular choice for canning and preserving food at room temperature, but they are not typically designed for freezing. The reason is that as water freezes, it expands. If you fill a mason jar with a liquid and then freeze it, the expanding ice could potentially crack the glass or, at the very least, make the lid difficult to open once thawed.

However, there are some exceptions. If you want to freeze something in a mason jar, you should not fill the jar to the top. Leave headspace (about an inch or more) to allow for expansion. Also, make sure the jar is properly sealed before placing it in the freezer. Some people have success freezing mason jars with this method, but it's always a risk, and it's not recommended for long-term storage.

If you're looking to freeze food in a mason jar for longer periods, it might be better to use a plastic container that's designed to withstand the expansion of frozen liquids.

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Since they lack the shoulders that most jars have, the jar isn't put under pressure when the broth freezes and expands. I don't have many of these, but I do reach for them first when I go to freeze broth. Someone even told me that they stick warm broth right in the freezer in wide mouth jars with nary a glass casualty.read more >>