Stack in Jacks

[starpaw]

I was just looking for one of these plastic containers, the sturdy type that are open topped and stack one way around, and when turned around fit into each other for easy storage and got no results back. I'm starting to think that "stack in jacks" might just be something we called them in our family? What the hell are they really called?

Do any of your familes have any words of phrases that have gotten you odd looks?