Dumb idea? No way, man. I don't know about you and your filthy life, but I'm a clean person. I like things a certain way. A clean way. I'm not a freak about it, but this kind of thing probably gets worse with age and one day I will be a freak about it. Which is fine. I'll come to terms with that then.
I don't own a car, but when I use one (my parent's) there is usually all kinds of crap laying around just being gross and hanging out. Why? Well, cars don't come with trash cans. Why don't they? I don't know, car-makers are idiots? No, I guess that's too rough. They're not idiots. But they clearly weren't smart enough to include some sort of repository.
This is a great idea - to use a cereal container in place of a bulky trash can. So slim! Almost invisible! And keeps things tidy.
Do you really want to have a gross smelling/looking car interior? People are judging you on that, bud. Hate to tell you. Get it under control.
(Thanks to Real Simple for the beautiful idea.)