Now that I'm building only 15mm stuff (with the possible exception of Into the Fray,) I decided to organize the post-apoc 20mm models and minis into a separate box to make them easy to find and use. I found a cardboard box that was going to be recycled and covered it with some gray paper. The box is about 8"x8"x4".
Inside, I've put all the models for my "post-apocalyptic playground", props and 20mm scale figures.
There's enough to moderately fill a 2'x2' board for some small skirmishes... good for playtesting new rule sets or for a quick game.