Mission Pack

Mission packs are experimental waste of Rockstar Games in San Andreas. They are never used in the original game, but they can be used for modding. Mission packs are used to get additional script content into the game. The most known mod using this technology is Design Your Own Mission by PatrickW and Dutchy3010.

In GTA IV a similar technology is used for the downloadable content called "The Lost and Damned" on XBox 360.