Word meaning an object can be "empty"

I'm looking for a single word that can describe a container object as having the ability to be in a state of emptiness.

The first word that springs to mind is "emptiable", but that implies an ability to change the state, rather than the possibility of "empty" being a state at all.

I'm looking for a word that describes that possibility. What do you call something that may or may not be empty?

I've been dancing around the word "void", but that seems to have the same issues (see "voidable").

Container isn't an adjective but it describes this concept perfectly well.

Decantable, depletable, or exhaustible? Perhaps you can provide some context?