A box made from thick cardboard, for storing goods, or a container made from cardboard or plastic, in which milk or fruit juice, etc is sold. (Cambridge Dictionary)
A carton is a plastic or cardboard container in which food or drink is sold. (Collins Dictionary)
A carton is a large, strong cardboard box in which goods are stored and transported. (Collins Dictionary)
A small, light box or container in which drinks or foodstuffs are packaged. (Oxford Dictionaries)
A box or container usually made of cardboard and often of corrugated cardboard. (Merriam – Webster)
Carton meaning in Cambridge Dictionary.
Carton. Your Dictionary.
Carton meaning Longman