We introduce three novel methods of Single Photon Cooling that generically cool and compress particle gas samples with high efficiency. The first method compresses the molecular gas density by three orders of magnitude and increases collision frequency in trapped samples. The second method compresses the phase space density of the molecular gas by at least two orders of magnitude. Designed with combinations of static electric and magnetic fields these first two methods cool the molecules with both magnetic and electric dipole moments from ~100mK to 1mK. In the third method the particles with magnetic dipole moments are trapped in their absolute ground state and the accumulation of particles via an irreversible loading step is possible. The high efficiencies calculated, compared to schemes involving cycling, are a result of cooling the particles with a single step.