Slax is one of the smallest, portable, and fast Linux operating systems with a modular approach and outstanding design built to run from a DVD or thumb drive.
Slax runs directly from your USB flash drive without installing, so you can carry it everywhere you go in your pocket. Despite its small size, Slax provides a nice graphical user interface and a wide selection of pre-installed programs, such as a Web browser, Terminal, and more.
Slax is now based on Debian, which gives you the ability to benefit from its entire ecosystem. Tens of thousands of prebuilt packages with applications, all within reach thanks to apt command.
You can purchase Slax on a DVD or thumb drive from the Author's website.