As an expert in kitchenware and home goods, I can tell you that not all mason jars are designed to be freezer safe. While traditional mason jars with two-piece lids are great for canning and storing food at room temperature or in the refrigerator, they are not typically recommended for freezing. This is because the freezing process can cause condensation inside the jar, which can lead to the lid becoming stuck or the glass breaking due to expansion.

However, there are specialized mason jars that are explicitly labeled as freezer safe. These jars are made with materials and have designs that can withstand the temperature changes associated with freezing without compromising the integrity of the jar or its contents.

When choosing a mason jar for freezing, look for one that is:

1. Made from thermo-resistant glass that can handle temperature changes.
2. Designed with a removable lid that won't get stuck due to condensation.
3. Certified as freezer safe by the manufacturer.

Always follow the manufacturer's guidelines for use to ensure the safety and longevity of your mason jars.

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Jars with necks (sauce & woozy bottles etc.) are not recommended, as the contents will expand upward into the part of the glass with a smaller diameter causing breakage. ... In addition to the chart (below) of Ball jars that are freezer safe; Orchard Road wide mouth pints are also freezer safe.read more >>