RMS GNU/Linux-libre is a project that puts emphasis on having a 100% free version of a lightweight distribution designed to run on a pendrive, to be the perfect pocket companion of freedom lovers. The feature of persistent changes between live sessions and the ability to get modules (software packages) activated and deactivated on demand make it ideal to carry it around and use it anywhere.

Or, as somebody else once put it, "a totally Libre, live CD or USB distribution stripped of fluff and dedicated to the needs of freedom loving users".