I bought this gallon just a few days ago, but when I went to pour a glass, I noticed the jug was swollen tight like a drum—even though it’s only halfway to the expiration date. Would you still use it, or throw it away?. August 10, 2026 by omar ADVERTISEMENT an important warning. If a milk carton, bottle, or jug suddenly appears swollen or unusually puffed up, it deserves attention. A change in the shape of the packaging can indicate that something is happening inside. Why a Milk Container Can Begin to Swell Milk is a perishable food. When microorganisms multiply inside spoiled milk, some can produce gases continue reading … ADVERTISEMENT ←PreviousNext→