Cargo Module (Apocalypse)
The Cargo Module allows for recovery of equipment left on the floor at the end of a mission where all hostile units - aw here applicable: mission targets - on the map have been defeated. Only equipment is recovered. Stunned organic lifeforms are catered for by the Bio-Transport Module.
The vehicle carrying the cargo module will then be able to unload all of its contents into the General Store module at any X-COM base it parks or docks at. If no stores are present, the equipment is kept on board the ship.
Though the information screens suggest that the module has a capacity of 50 units of equipment, there is no actual upper limit to what they can store. This means that only one cargo module is required to get all of the equipment from a mission site.