You know, there's different ways to define "useful". If something is important or even essential, it's useful; if something is convenient or gets used all the time, then it's useful; if something has lots of different functions, it's useful, etc.
From the last perspective -- many functions -- I think a milk crate is a useful bit of kit. Not important or essential by any means, but you can do so many things with it! For instance, you can sit on it or stand on it; use it as a table or as table legs; wedge doors open with it; weigh things down with it; carry things in it; even stick it in front of a light to create an impromptu gobo.
From the last perspective -- many functions -- I think a milk crate is a useful bit of kit. Not important or essential by any means, but you can do so many things with it! For instance, you can sit on it or stand on it; use it as a table or as table legs; wedge doors open with it; weigh things down with it; carry things in it; even stick it in front of a light to create an impromptu gobo.
