MultiSystem USB
One has to go to SourceForge and download this CD and boot it. It is Ubuntu based distribution which I used to install number of Linux distribution on a USB. However, some distributions do not support MutiSystem booting.
I have several MultiSystem USBs which I use to display Linux distributions to new comers. It supports most of the Ubuntu Based Distributions except Ubuntu. I have installed Gparted as a default distribution.
It is there for "on the go" partitioning of new hard disk.
Tails do not support it now but it used to support it.
I am going to install Linux Mint cinnamon desktop today.
Arched based Manjero can be booted with MultiSystem but none of the Debian Live DVDs is supported. It needs Squash file (single hierarchical file) for live booting.
Almost all Puppy Linux distributions support squash file system. Instead of having several Puppy Linux USN sticks in my pocket several can be included in a MultiSystem USB with 32GB storage.
Interestingly, Knoppix with a persistent store is included in my MultSystem USB stick.
Its booting CD is not freely available and it comes from France with English language support. However, I downloaded it from SorceForge today.