ZipSlack
ZipSlack is a special edition of Slackware Linux that can be installed
      onto any FAT (or FAT32) filesystem with about 100 MB of free space. It
      uses the UMSDOS filesystem and contains most of the programs you will
      need. This means that you do not need to repartition your hard disk if
      you already have DOS or Windows installed. ZipSlack installs into a directory on your DOS filesystem. It can also be installed to and booted  
      from a Zip disk.
     
This distribution is ideal for people who don't have a lot of hard
      disk space, do not have a fast Internet connection to download the entire
      distribution, or who want a Linux distribution they can carry around on
      a Zip disk.
 
 
 
BigSlack
New with Slackware 7.0 is BigSlack - another special edition of  
      Slackware Linux.  BigSlack is similar to ZipSlack in that it is
      designed to be installed to a FAT filesystem, without the need to
      repartition your drive to get the benefits of running Slackware
      Linux.  
     
The main difference in BigSlack and ZipSlack is what's included.
      BigSlack includes the majority of a full Slackware install -  
      including a preconfigured X Windows setup and GNOME.  As such, it
      takes much more space than ZipSlack, requiring about 850 megs of free space.
     
BigSlack is ideal for people who have the hard drive space to
      spare, are looking to try out a full Slackware Linux installation,
      but do not want to repartition their hard drive.