No silly MDF here, the MUJI speakers are make entirely from non-corrugated cardboard. Approximately 3.5" square, the MUJI speakers can fold up and store in a little pouch. They also sport top of the line, full range hi-eff drivers and are rear ported so make sure you move them away from the wall to really unleash their full potential.

$42 at the Moma Store. [via OhGizmo!]