What is the Difference between regular insulated food/beverage coolers VS vaccine carriers and cold boxes?

what are the main distinguishing factors between regular insulated food/beverage coolers VS vaccine carriers and cold boxes? 

Why do we only use "vaccine carriers and cold boxes" and not regular insulated kitchen cold boxes and carriers for immunization? 

Are Vaccine carrier and cold boxes used for carrying food and beverages? 

Are vaccine carriers and cold boxes the same as regular insualted boxes ?