Leaktight container having a flexible wall comprising a fixing ring for joining it to a device allowing the container to be removably connected to an enclosure

A leaktight container having a flexible wall comprising:

• a bag formed from a flexible plastics film arranged so as to define a leaktight interior volume and comprising a through-opening,
• a connecting device which allows for leaktight connection of the leaktight container to a sterile enclosure equipped with a complementary connecting device, said connecting device comprising a flange, and
• means for fixing the bag to the flange;
• wherein the fixing means comprise a fixing ring arranged so as to allow the connecting device to be fixed reversibly to said bag, said fixing ring being made up of two concentric annular parts dissociated from the flange, said two concentric annular parts being fitted one in the other in order to define, respectively, an internal annular part on which the flange is clip mounted in a reversible manner and an external annular part that is clip mounted on the internal annular part, the external annular part being dimensioned so as to be force-fitted around the internal annular part and to exert a radial stress thereon, a portion of film delimiting the through-opening being gripped between the external annular part and the internal annular part.