Bag system with device for associating sampling receptacles

A bag system for collecting a biological fluid comprising:

• a collection device;
• a fluid collection bag in fluid communication with the collection device;
• and
• a sampling device in fluid communication with the collection device, the sampling device including:
• at least one sampling receptacle;
• a transfer device having an associating device having a hollow guide open at a front part to allow introduction of the at least one sampling receptacle and one or more flexible projections on an internal face of the hollow guide,
• wherein the one or more flexible projections are arranged so as to be deformable by sliding the at least one sampling receptacle inside the hollow guide, and wherein at least one of the one or more flexible projections is reversibly deformable from a position inclined towards the front part of the hollow guide to a position inclined towards a rear part of the hollow guide by contact of the at least one sampling receptacle while sliding inside the hollow guide in a front to rear direction, and from a position inclined towards the rear of the hollow guide to a position inclined toward the front of the hollow guide by contact of the at least one sampling receptacle while sliding inside the hollow guide in a rear to front direction, and
• wherein the associating device is operable to support the at least one sampling receptacle in a standby position, guide the at least one sampling receptacle to a transfer position, and allow dissociation of the at least one sampling receptacle from the bag system.