This paper goes beyond critiques of western philosophical notions of space as passive, feminine, and unintelligent by reconfiguring containment as an (inter-)active process. The author draws on work in the history of technology, on a cybernetic epistemology that emphasizes the interdependence of organism and environment, and on intersubjectivist psychoanalytic theories of the maternal provision. A more unexpected ally is found in Heidegger, whose writings on holding and supply are read in ways that contribute to the development of an urgently required philosophy of container technologies.