The proton pack is a fictional energy based capture device, used for capturing and entraping ghosts. Ghostbusters universe. First depicted in the film Ghostbusters, it has a hand-held wand (Neutrino Wand or particle thrower) connected to a backpack-sized particle accelerator. It fires a stream of highly focused and radially polarized protons that electrostatically traps the negatively charged energy of a ghost, allowing it to be held in the stream.

The Trap is a sealed container that allowed the Ghostbusters to transport the spirits to the Containment Unit, where they would be released into the grid. It is unclear what happens to the trap once placed inside the grid, though some have theorized that when a captured ghost is put into the Containment Unit, the entity is pumped out of the trap cartridge so it can be used again.