Abstract: A compensation element, in particular a filter system, that is configured for volume compensation for a freezing medium. The compensation element includes an elongated hollow body with a first end and a second end, at the first end a coupling area being situated which closes the hollow body, and the second end in particular being open, the compensation element having an elastically reversible design in order to return back to the initial state after a deformation from an initial state that has taken place due to ice formation by the medium, and the hollow body having a cross section with a circumferentially closed outer area, and including an inner structure that is situated at an inner circumference of the outer area.