Opening the refrigerator and finding a milk jug swollen tight like a drum can be alarming, especially when the date printed on the container is still weeks away. Many people assume that the expiration date guarantees the milk is safe, but that date is only one part of the food-safety picture.
A swollen milk container can be a warning sign that something has changed inside the package. When milk spoils, microorganisms can multiply and produce gases or other byproducts. In a tightly sealed container, those gases can cause the plastic jug to expand and become unusually firm or bloated.
If a milk jug looks significantly swollen, do not open it just to see whether it smells or tastes normal. Spoiled food can sometimes have an unusual appearance or odor, but relying on smell alone is not a reliable food-safety test.
The safest choice is to avoid drinking milk from a container that is noticeably swollen. Keep the container closed, place it somewhere secure, and contact the store where you purchased it or the manufacturer. If you still have the receipt, lot number, or date printed on the container, keep those details available because they can help the retailer or manufacturer investigate the problem.
Temperature is another important factor. Milk needs to remain properly refrigerated throughout storage. If it has been exposed to warmer temperatures for an extended period, spoilage can occur even when the printed date has not passed. A refrigerator that is too warm, a door that is frequently left open, or a temporary power outage can all affect dairy products.
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