The present invention relates to a disposable cartridge for a drug delivery device, the cartridge comprising: —a flexible bag (81； 181) to accommodate a liquid medicament and having an opening (81a, 181a) adjacent to a sidewall (81b, 181b), a socket (76, 176) having a fluid channel (86； 186) in fluid communication with a cartridge fluid coupling (90； 190), wherein the socket (76, 176) extends into the opening (81a, 181a) of the flexible bag (81； 181), a housing (71； 171) covering at least a portion of the flexible bag (81； 181) and having a receptacle (71a, 171a) to receive the socket (76； 176) with the flexible bag (81； 181), wherein the flexible bag's (81； 181) sidewall (81b； 181b) is fixed between the socket (76； 176) and the receptacle (71a, 171a).
