It's a medium-sized chassis that supports up to E-ATX motherboards, multiple drives, larger AIO liquid cooling radiators, and ...

The best budget Mini-ITX case is the Hyte Revolt 3, as it's reasonably priced for a small and handy chassis. I've spent a serious chunk of time jamming components into a wealth of Mini-ITX cases ...

Being a small form factor case ... on the size of the motherboard they can accommodate. The larger E-ATX or ATX cases can accommodate smaller motherboards, but not the other way around.