Porous liquids (PLs) realize permanent microporosity in the liquid state and are well-suited to a range of applications. Porous ionic liquids (PILs) represent a sub-class of PLs, which are porogens incorporated with ionic liquids as functional groups or as solvents. The available porosity of a PIL depends on the concentration of pores within the system. Neat PILs, which consist of a liquid porogen without any solvents present to effectively dilute the pores, offer the potential of accessing the highest theoretical pore volumes in a liquid. However, the challenge lies in the difficulty of designing large, shapepersistent pore carriers that melt at reasonable temperatures. Here, we construct a neat PIL via post-synthetic modification of a low-molecular weight porous organic cage; specifically, an imine cage was reduced and aminal-tied with aldehydes to reintroduce some structural rigidity into the cage. An ionic liquid moiety was pre-incorporated into the aldehydes, resulting in a porous molecular structure that melts at the desired temperature. The resulting bulk material was an amorphous solid but displayed melting behaviour over 55-90 °C; this successfully demonstrated the inheritance of ionic liquid properties from the aldehydes to the cage itself. Porosity of the PIL was confirmed through both experiments and computation.