During the summer, plastic shrinks because of heat so the indents are made slightly larger to prevent milk overflow, according to Food Republic, a news outlet for recipes and cooking tips.

Does it matter if I buy it in plastic, cardboard, or glass? The Lantern wonders whether the first humans to wring milk from a cow’s udder around 9,000 years ago had any idea what kind of ...

(FOX40.COM) — Just about every plastic milk jug has a circular indent placed on its side, but why? Is it just decoration? Does it help determine if the dairy product is expired? Some people may ...

(KTXL) – Just about every plastic milk jug has a circular indent on its side, but why? Is it just decoration? Does it help determine expiration? Some people may not have ever noticed it.