A fluid transfer system comprising: a container comprising: a container body having a sidewall extending between an open top end and a bottom end along a central axis to define an interior cavity; and at least one protrusion aligned with the central axis and extending from an interior portion of the sidewall into the interior cavity; and a connector configured for receipt within the interior cavity, the connector comprising: a body having a distal end, a proximal end, and a sidewall extending between the distal end and the proximal end and defining a fluid passageway therethrough; an inner member provided at one of the distal end and the proximal end of the body; an outer member surrounding at least a portion of the inner member, the inner member configured to rotate freely relative to the outer member; and a locking arrangement provided on at least a portion of the inner member, wherein the locking arrangement is configured for cooperating with the at least one protrusion to prevent rotation of the inner member relative to the outer member, characterized in that the locking arrangement is accessible through at least a portion of the outer member. a container comprising: a container body having a sidewall extending between an open top end and a bottom end along a central axis to define an interior cavity; and at least one protrusion aligned with the central axis and extending from an interior portion of the sidewall into the interior cavity; and a container body having a sidewall extending between an open top end and a bottom end along a central axis to define an interior cavity; and at least one protrusion aligned with the central axis and extending from an interior portion of the sidewall into the interior cavity; and a connector configured for receipt within the interior cavity, the connector comprising: a body having a distal end, a proximal end, and a sidewall extending between the distal end and the proximal end and defining a fluid passageway therethrough; an inner member provided at one of the distal end and the proximal end of the body; an outer member surrounding at least a portion of the inner member, the inner member configured to rotate freely relative to the outer member; and a locking arrangement provided on at least a portion of the inner member, wherein the locking arrangement is configured for cooperating with the at least one protrusion to prevent rotation of the inner member relative to the outer member, characterized in that the locking arrangement is accessible through at least a portion of the outer member. a body having a distal end, a proximal end, and a sidewall extending between the distal end and the proximal end and defining a fluid passageway therethrough; an inner member provided at one of the distal end and the proximal end of the body; an outer member surrounding at least a portion of the inner member, the inner member configured to rotate freely relative to the outer member; and a locking arrangement provided on at least a portion of the inner member, wherein the locking arrangement is configured for cooperating with the at least one protrusion to prevent rotation of the inner member relative to the outer member, characterized in that the locking arrangement is accessible through at least a portion of the outer member.