Patent US7114722 - Plastic kubb (coob) game & carrying case - Google Patents
www.google.com/patents/US7114722
From the page
Saved with the link. Notes from 2007 to 2016 are mostly the page's own words, so this is probably an excerpt.
Apparatus that interconnects the twenty-one pieces used to play the ancient backyard target-throwing game “kubb”, pronounced “coob”, into a portable self-contained carrying case that looks like a briefcase. An improvement over transporting kubb in heavy crates, boxes, or bags.