The original Fallout: New Vegas Ultimate Edition (official) on Steam or GOG is about 9–10 GB. A FitGirl repack can shrink that to – critical for users with limited bandwidth, capped internet, or older hardware.
While there are many "repacks" of New Vegas, the SiMON source is widely regarded in the community as one of the "cleanest" pre-cracked versions available. Fallout.New.Vegas.All.DLC-SiMON -2xDVD5- fitgirl repack
Popular mods confirmed to work:
This repack includes the base game and all official add-ons: The original Fallout: New Vegas Ultimate Edition (official)