A viral social media post has sparked discussion on the real reason plastic milk ... carton, writing: “Most people will go their entire lives without ever knowing what the circular dent on the ...

(FOX40.COM) — Just about every plastic milk jug has a circular indent placed on its side, but why ... the circular indent has to do with the carton’s ability to freeze.

(KTXL) – Just about every plastic milk jug has a circular indent on its side, but why ... user suggested the indent has to do with the carton’s ability to expand in cold temperatures.