Given an object that can hold a capacity of something, is there a word which describes the current amount it holds towards that capacity?
For example, if an elevator has a capacity of 20 persons, and the current number of occupants is six, the elevator's
<some property of the elevator> is six?
Update: The commentary on @jwpat7's excellent answer made me realize something which hadn't occurred to me: the nature of the container and the things it holds have an impact on the appropriate description. I picked an arbitrary example using people, but the reason I've been seeking this word is to describe discrete (i.e. not something like liquid in a tank) inanimate contents.
A better example would be: an egg carton has a capacity of 12 eggs. It currently holds 7. How does one describe the amount currently held: "The carton's
<this> is 7 eggs"?