Going Postal

In our new home I have this awesome little postal-type-cubby-thing. Problem is I've been afraid I wouldn't be able to keep it tidy looking, you know just randomly tossing mail or things into slots, day after day, until they are full of random stuff and everything else. 

And whaddya know:

And this is after a dejunking.  So, ultimately I decided to do something. And after fruitless attempts at finding baskets narrow enough to fit in those slots (not even the Container Store could help me) I moved on to Plan B.  

The only question was three or four, and I went with three:

This I can manage.