""Atlas" and "Mason" markings on popular commercial jars - like those Classico pasta sauce jars - do not mean that the jar is fit for reuse in home canning. The truth is that those labels are basically decorative. In fact, on Classico's website (it's a Kraft Heinz company), an old FAQ page shut down the question, stating that its jars were not suitable for home canning because a coating is applied which could lead to scratches and breakage."
"While the hobby of canning saw an increase during the COVID-19 pandemic lockdown in the U.S., the pastime has stuck around. A search for canning on both Instagram and TikTok reveals nearly 2 million posts combined. Driving reasons behind the uptick range from worries about food security and food additives to concerns over food waste and sustainability. But these good intentions don't mean that Americans are canning correctly or even safely."
Canning grew in popularity during the COVID-19 pandemic and remains widely practiced, with nearly two million related social media posts. Motivations include concerns about food security, additives, food waste, and sustainability. Commercial jars marked "Atlas" or "Mason" are not suitable for home canning because manufacturers apply coatings and use lighter glass that can scratch or break under canning conditions. Classico (Kraft Heinz) advises against repurposing those jars. University of California specialists note that if people ignore warnings, those jars should only be used for water or steam canning and never for pressure canning. Social media guidance can be unsafe and skipping recipe steps increases risks.
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