The NaCl-based buffer allowed the nanotubes to self-assemble isothermally inside compartments (water-in-oil droplets as well as giant unilamellar vesicles serving as cell models), where they not only grow but also spontaneously reorganize, without addition of any crosslinking or condensing agents, into dynamic higher-order assemblies such as networks and ring-like structures, forming a valuable example of confinement-induced self-organization in a synthetic cell-mimicking system.