Abstract: The invention relates to a container/container support assembly, notably for a medical gas cylinder, comprising a gas container (11) comprising a protective cap (3) comprising a peripheral wall (3), and a container support (20) able and designed to accept and bear said gas container (11). The protective cap (3) of the gas container (11) comprises a fixing element (10) projecting from the surface of the peripheral wall (3), and said container support (20) comprises an attachment system (24) for fixing said container support (20) to a bearing structure (30), and a housing (22) able and designed to accept said fixing element (10) borne by the protective cap (3) of the gas container (11) so as to secure said gas container (11) to said container support (20) when said fixing element (10) is positioned in said housing (22) of the container support (20).