That tight, drum-like swelling is a major red flag. It means gas is actively building up inside the container due to rapid bacterial or yeast fermentation.
What You Should Do Immediately
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Do Not Open or Taste It: Opening a pressurized jug can cause the liquid to violently spray, or worse, rupture the plastic. Consuming spoiled or heavily fermented dairy or juice can cause severe food poisoning.
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Check the Product Type:
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If it’s milk or dairy: Throw it away immediately. Milk should not ferment and create gas pressure under normal circumstances; this indicates contamination and spoilage well before the expiration date (often caused by improper cold-chain storage at the store or a tiny seal leak).
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If it’s fresh juice, cider, or kombucha: Natural fermentation can happen if these items weren’t pasteurized or if they sat out in the warmth, but if it wasn’t meant to be carbonated, it’s still best to discard it.
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Return or Report It: Since you bought it just a few days ago, take a photo of the swollen jug and the expiration date, and contact the grocery store or manufacturer. They will usually refund or replace it, as a premature blowout points to a storage or pasteurization failure.
