Originally Posted by
SouthFLpix
Topeak makes a really great quick release crate, but it is proprietary to their rack system. It's even foldable.
It's also very expensive.
You could also put a collapsible crate on there, like a CleverCrate, those fold down flat and you can then bungee whatever you like on top of the flat folded crate, and unfold it and use it as a crate as needed.