Collapsible conduit, patient interface and headgear connector

A nasal cannula comprising:

• a manifold comprising at least one nasal prong or outlet extending from the manifold, wherein the at least one nasal prong or outlet is, during use, received by a user's nare;
• a first side member extending from a first side of the manifold;
• a second side member extending from a second side of the manifold;
• and
• wherein, in a planar view, the first side member and the second side member form an obtuse angle when the nasal cannula is in a neutral or unbent configuration;
• wherein the nasal cannula comprises a wall near to and on an inlet side of the at least one nasal prong or outlet, wherein the wall is configured to separate a lumen of the first side member from the manifold and the second side member such that only the first side member acts as a conduit to provide a flow of gases from an inlet of the nasal cannula to the manifold;
• and
• wherein a collapsible conduit portion is integrally formed in or with the first side member of the nasal cannula, wherein the collapsible conduit portion is configured to transition between an open configuration wherein the conduit provides the flow of gases from the inlet to the manifold, and a collapsed configuration wherein the flow of gases is from the inlet to the manifold is reduced or stopped.