The top & bottom is made up of two half boxes. It is a kind of carton, often put together as a tray and a cover (i.e. two half boxes). This type of corrugated cardboard is made for heavy loads, and long journeys. The cover is reinforced to give greater strength.
The assembly is very quick and easy: it can be done manually or automatically, with assembly finishing glued or automatic.
This type of box can be a Tray + its Cover, in that case, it is often used as display.
It also can be a telescopic box such as shoe boxes.