I'm watching CSA videos, and have watched numerous documentaries before, and have noticed that both Astronauts and Cosmonauts alike aboard the ISS tend to refer to something as either Russian, or American.
In a Chris Hadfield video, he refers to a towel as being a "Russian Towel", and numerous documentaries, other mundane objects as either being a "Russian object" or "American object".
Why bother noting the origin of the objects used upon the ISS? Is it because of international differences or is there some major cause of concern if not mentioned?