Internal threaded tube

A tube assembly for dispensing product comprising:

• a tube comprising:
• a closed first end,
• an open second end opposing the closed first end,
• a side wall extending between the closed first end and the open second end, wherein the side wall and the closed first end define an interior portion configured to hold product, and
• internal threads extending inwardly from the side wall adjacent to the open second end;
• and
• a closure assembly selectively couplable with the open second end of the tube, wherein the closure assembly comprises external threads extending outwardly from the closure assembly that correspond to the internal threads of the tube;
• wherein the tube assembly comprises interlocking features configured to prevent fluid from entering the tube assembly between the tube and the closure assembly when the closure assembly is coupled with the open second end of the tube, wherein the interlocking features comprise:
• an inner annular flange positioned about an interior surface of the side wall of the tube between the open second end and the internal threads, wherein the inner annular flange is configured to abut an inner annular flange of the closure assembly,
• an outer annular flange positioned about an exterior surface of the side wall of the tube between the open second end and the internal threads such that the outer annular flange is positioned closer to the open second end than the inner annular flange, wherein the outer annular flange is configured to abut an annular protrusion of the closure assembly, and
• an interlocking annular protrusion extending from the open second end of the tube, wherein the interlocking annular protrusion is configured to insert within an annular recess of the closure assembly.