The XS stock light freighter was a model of 101 meters long and 88 meters wide freighter manufactured by CEC and used mostly by smugglers

Smuggler Organization Communities

during the Great Galactic War, its resultant Cold War and following Galactic War. One is used by Voidhound

Voidhound Character Major Characters

.
The XS was considered a major advancement in armament, speed and versatility over previous models of light freighter. It was considered one of the fastest and most agile starships in the galaxy. It contained a large cargo hold, including many hidden compartments throughout the ship, ideal for smuggling or simply hiding valuables. The XS also boasted powerful engines which allowed it to easily outrun most opponents or authorities, but in the event a fight was necessary, it came armed with standard torpedo launchers and laser batteries. In addition, it also held upper and lateral laser turrets armed with HSG-67 laser cannons which could be fired manually, or remotely from within the cockpit. Due to the fact that many smugglers and freighter captains both worked and lived aboard their ships, the XS was also designed with many of the standard comforts any being would need, including a lounge for recreation and extra sleeping quarters.
Millennia later, designers working for the Corellian Engineering Corporation

Corellian Engineering Corporation Organization Manufacturers

used the schematics of the XS stock light freighter as an inspiration during the development of the YT-1000 freighter.