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An Apollo Lunar Sample Return Container used during the Apollo 11 mission.

The sign which accompanied it read

Lunar Sample Return Container

This sample return container, or "rock box," is one of two used by Apollo 11 astronauts to return 21.6 kilograms (47.7 pounds) of lunar material to the Earth following the first walk on the Moon, July 20, 1969. The containers are constructed of aluminum and stainless steel.

After an Apollo Lunar Module (LM) descended to the lunar surface, the astronauts took the sample return containers from a storage compartment in the descent stage. The containers were then filled with lunar material, sealed, and returned to the ascent stage of the LM.

The steel mesh pads in the boxes protected the lunar samples from damage during reentry and splashdown.

The "storage compartment in the descent stage" to which the sign refers is actually the modularized equipment stowage assembly (MESA), on the exterior of the Lunar Module pilot's side of the descent stage.

This item is Smithsonian collections ID #A19710814000.