While my mom was visiting in the city a few weeks ago, she had asked me if it was ok to bring her suitcase in the subway when she went to the airport.
"Do you ever see anyone in the subway with a large suitcase?" she had asked. I had replied, "Of course."
If there should ever come a time when she asks me if I have ever seen anyone in the subway with a mattress, I will reply, "Of course."