How molecules pack has vital ramifications for their application in areas such as optoelectronics, 1 catalysis, 2 and drug delivery. However, the lack of strong bonds has resulted in the long-standing challenge of how to design molecules to manipulate crystal formation for specific packings with desired properties. The prediction of solid-state packing is non-trivial and is more complex for molecular materials than their inorganic counterparts. Reticular design rules implemented in extended framework formation such as metal-and covalent-organic frameworks fail when applied to organic molecules due to their packing being determined by weak dispersion forces.