The number 18 refers not to a size, but to the 18 tracks or 18 assets inside the repack. These included:
The repack’s hidden manifesto (found in a .txt file named READ_ME_LIFESTYLE.txt ) contained a now-famous set of 18 rules for living in the post-interstellar era. A few excerpts: 18 lolita from interstellar space 2014 web repack
But no, this isn’t a sci-fi plot. It’s a web repack. The number 18 refers not to a size,