Every Linux user, after a while, starts creating a toolbox that he/she takes with him/her everywhere. However, that depends on the task at hand. You might need to install a distribution, you might just need a livecd, doing security-related work or just backup. And so the toolbox gets bigger and bigger, thus becoming less and less convenient.
This is a companion discussion topic for the original entry at https://linuxconfig.org/one-cd-disk-multiple-linux-distributions-netboot-cd/