Once a ghost has been captured in a proton beam, the next logical question is what to do with it? After all, it is highly impractical to simply leave it in the proton beam forever. A portable, reusable unit was needed to store the ghosts that had been captured. To serve this purpose, the ghost trap was invented.

The ghost trap works using the same basic principals as the proton pack. Inside of the trap's outer shell is a steel confinement grid, which has been electrified with a strong positive charge. The charge of the trap is set slightly higher than that of the proton beam, so that once a ghost has been maneuvered over the trap, the beam can be shut off and the ghost is pulled into the confinement grid. Like the proton pack, the field strength used depends on the strength of the ghost being fought.

The trap is operated with a simple foot petal. Stomp once to open the trap and emit a positive field of the same strength of the proton beam. Stomp again (after the proton beam has been shut off) and the trap will activate a stronger field, pulling the ghost in and closing the trap doors.

Now that the ghost has been stored temporarily in the trap, the time has come to move it to its new home: the containment unit.