A kit capable of being assembled into a passive thermally controlled bulk shipping container (10), and associated method of assembly and resultant assembled shipping container. The kit includes (a) an outer shell (20) defining a retention chamber (29), (b) at least eight separate and distinct identically sized phase change material-containing panels (50), and (c) at least four separate and distinct identically sized jackets (60), each configured and arranged to releasably retain a set of the phase change material panels in a planar configuration.