USB/Pendrive Linux with RAM storage only?

[Fli]

Hello,

please does anyone know about any linux system which can be put onto USB flash disk and boot from there + save data only into RAM?

I tried Tails Home, Wikipedia, SourceForge

and found these another distributions:

Whonix - Home, Wikipedia (https://en.wikipedia.org/wiki/Whonix) , SourceForge (http://sourceforge.net/projects/whonix/) , Github (https://github.com/Whonix/Whonix/)
Liberté Linux - Home (http://dee.su/liberte) , Wikipedia (https://en.wikipedia.org/w/index.php?title=Libert%C3%A9_Linux), SourceForge (http://sourceforge.net/projects/liberte/) , Github (https://github.com/mkdesu/liberte) (vs Tails => lightweight, less programs, can install on hd)
Ipredia OS - Home (http://www.ipredia.org/os), Wikipedia (https://en.wikipedia.org/w/index.php?title=Ipredia_OS), SourceForge (http://sourceforge.net/projects/ipredia/)

List of Linuxes that run from RAM: https://en.wikipedia.org/wiki/List_of_Linux_distributions_that_run_from_RAM

Tails vs Liberté (https://tails.boum.org/forum/Libert%C3%A9_Linux_vs._Tails/)