not necessarily. If you have kids in the car, a trash can will be handy. I could certainly use one.
The product has value, and solves the problem at hand in a unique way.
Being in the car for a few hours with an exposed banana peel isn't the greatest, regardless of what happens to it at the destination.
I mean, yeesh, people have their reasons for having a trash can in the car. I'm a take-your-shit-with-you kind of guy myself, but I don't have kids and I don't eat in the car. Sure, that makes me a superior human being, but I don't rub it in people's faces.