If you see someone on the street dressed like a middle-class person (say, in clean jeans and a striped shirt), how do you know whether they’re lower middle class or upper middle class? I think one of the best indicators is how much they’re carrying.
Lately I’ve been mostly on the lower end of middle class (although I’m kind of unusual along a couple axes). I think about this when I have to deal with my backpack, which is considered déclassé in places like art museums. My backpack has my three-year-old laptop. Because it’s three years old, the battery doesn’t last long and I also carry my power supply. It has my paper and pens, in case I want to write or draw, which is rarely. It has a cable to charge my old phone. It has gum and sometimes a snack. Sunscreen and a water bottle in summer. A raincoat and gloves in winter. Maybe a book in case I get bored.
If I were rich, I would carry a MacBook Air, an iPad mini as a reader, and my wallet. My wallet would serve as everything else that’s in my backpack now. Go out on the street and look, and I bet you’ll see that the richer people are carrying less.