The first type I PIL was reported by Nitschke and co-workers, where ionic liquid functionality was incorporated onto the periphery of a metal-organic cage (MOC). Dai and co-workers reported a supramolecular complexation strategy between an anionic porous organic cage (POC) and different crown-ethers to form type II PLs with similar properties to type I PILs. Moving towards other molecular organic species, other examples of macrocyclic ILs include cyclodextrins and pillar [5]arenes, which were both post-synthetically modified with ionic liquid functionality, with the latter reported to exhibit significant CO2 uptake (5.52 mol/mol at 1 bar). A similar approach has been applied to metal-organic framework nanocrystals by surface modification with ionic liquids. Type II and type III PILs have also been reported. For example, MOCs have been dissolved in a handful of ILs. Similarly, MOFs, zeolitic-imidazolate frameworks (ZIFs), zeolites, 14 hollow carbon nanospheres, POC microparticles, and covalent organic framework (COF) particles, have all been dispersed in ionic liquids using different strategies. However, compared to type II and III PILs, type I PILs could offer higher pore volumes due to the lack of a fluidising solvent, alongside improved stability and processability. However, type I PILs arguably remain the most challenging to realise experimentally, with it often proving difficult to render large molecular pore carriers meltable. Ideally, such PILs should be liquid at or near room temperature while maintaining the shape persistence of the pore carrier and avoiding interpenetration of the fluidising periphery functionalisation into the cavities to ensure permanent porosity is present in the liquid state. Here, we report the synthesis of an organic cage-derived neat porous ionic liquid, [RCC1-IM][NTf2]6 (where IM = 3-(3-(4formylphenoxy)propyl)-1-methyl-imidazolium, and NTf2 = bis(trifluoromethanesulfonyl)imide), formed using a postfunctionalisation strategy. Previously, Liu et al. reported the reduction of imine-derived POCs into flexible amine cages, which could subsequently be aminal 'tied' with small aldehydes to re-introduce shape-persistence. These tied-reduced organic cages exhibit increased stability due to the removal of the reversible nature of the imine bond, an added advantage in targeting neat type I porous liquids. In addition, the reduced organic cages exhibit melting transitions and, as such, could also be processed into melt-quenched glass phases, which demonstrated enhanced gas uptake over the pre-processed amorphous material. This reduction-aminal formation approach was adopted here to construct an organic cage-based ionic liquid using a larger ionic-liquid functionalised aldehyde. The resulting material exhibited both a melting point below 100 °C and a glass transition on melt-quenching, with the amorphous solid, liquid, and melt-quenched glass phases all exhibiting comparable CO2 uptakes, and molecular dynamic (MD) simulations confirming the size-exclusivity of the selected ionic liquid anion from the organic cage cavity, and therefore, it's permanent porosity.