Compression collars for coupling a tube to a tube fitting

A bioprocessing coupling assembly comprising:

• a compression collar comprising:
• a tubular body comprising a resiliently flexible polymeric material, an interior surface and an opposing exterior surface that continuously extend parallel to each other between a first end and an opposing second end of the tubular body, the interior surface having a circular cross section, and bounding a throughway extending through the tubular body and forming an inner diameter of the tubular body, the inner diameter being constant along a length of the body between the first end and the second end;
• an end of a tube disposed within the throughway of the compression collar so that at least a portion of the end of the tube is encircled by the interior surface of the tubular body, the tube bounding a tube passage;
• and
• a tube fitting at least partially disposed within the tube passage, wherein the tube fitting is a port coupled to a flexible bioprocessing container comprising at least one sheet of film;
• wherein the compression collar is configured to resiliently rebound from an expanded state to a constricted state to radially inwardly compress the tube against the tube fitting.