Would you be happy with one pair of scissors? One frying pan and one pot? How about one car for the family? Or even one vacation a year?
I've been thinking about where in my life "just one" is enough. I go to the gym two times a week. Exercise clothes now are easy to hand wash and dry in a short time. One set of exercise clothes for each season (fall/spring, summer, winter) plus one jacket is enough. When I take walks I wear the same clothes I wear at home generally so that is all I need to exercise.
I'm not sure where else in my life "just one" is enough but I am thinking about it!