[en] The application of imploding liner flux compression techniques to the compression of plasma in simple, axially symmetric confinement geometries leads, at least in principle, to the possibility of very compact fusion reactors. Scaling laws are derived for liner-plasma systems in straight theta-pinch, spindle-cusp and cusp-ended theta-pinch configurations. Results are presented from two-dimensional computations of liners imploding on a cusp plasma. Stabilization of the inside surface of the liner against Raleigh-Taylor instabilities can be achieved by rotation of liquid liner. Coupled with electromagnetic compression systems, this should lead to reversible, non-destructive compression-expansion cycles reaching megagauss fields and plasma densities approximately 10¹⁹ cm^-3 at peak compression. The most promising configuration for a reactor appears to be the theta-pinch with cusp ends. (author)