Bion also connected the relation of container and contained to the question of transformation, seeing the former as transforming experience for the latter. What Jung means by ‘container’ seems to involve setting the emotional tone and pace, dominance and so forth.
This passage directly compares Jung’s and Bion’s container-contained models, arguing that both link containment to transformation while distinguishing their emphases, and shows how the concept illuminates unconscious collusion in ongoing relational dynamics.
, Jung and the Post-Jungians, 1985thesis