Zip compresses each file separately. A folder full of zip files, each containing a single file, should take up roughly the same space as a zip archive containin

Zip compresses each file separately. A folder full of zip files, each containing a single file, should take up roughly the same space as a zip archive containing all of the files. tgz doesn't do this, so it has a higher compression ratio for large collections of files. However, you cannot extract a single file alone from a tgz archive. This is why zip was designed the way it was.