A metal [[lunchbox]] with a shape similar to a rounded-top home [[mailbox (incoming mail)|]].  This type of lunchbox featured a large rounded top with a handle.  The top was affixed to the base by a hinge and inside the top you could store a [[thermos]] bottle for drinks.  Frequently tied in the past with the imagery of working laborers, such as construction workers, in North America.

h4. See also

* [[American lunchbox]]
dome lunchbox