Are California shoppers legally required to stop for receipt checkers at store exits?
“When it pops out, the milk is going bad,” one Facebook users named Cory Andersonclaimed.
Another social media user suggested the indent has to do with the carton’s ability to expand in cold temperatures.
“It’s so if you freeze the milk the bubble gives it someplace to expand to so it won’t bust the carton,” said a Facebook user named Andrew Serpico.
