Exton|OS build 161231 is based on Ubuntu 16.10 64 bit and Debian Stretch/Sid (upcoming Debian 9). Exton|OS's ISO file is a ISO-hybrid, which means that it can very easily be transferred (copied) to a USB pen drive. You can even run Exton|OS from a USB stick and save all your system changes on the stick. I.e. you will enjoy persistence!