They are known as "Attached Lid Containers". The page from Enco (lower right).
http://www.use-enco.com/CGI/INPDFF?P...PARTPG=INLMK32 Multiple sizes (and prices). Available from many industrial suppliers and several brands.
We bought several a couple of years ago to store the bigger stuff (wheels, motors, etc.) Each subteam has claimed a couple for storage.