to undo or remove the contents from (a box, trunk, etc.).

to remove (something) from a container, suitcase, etc.

to unburden, as the mind; reveal.

to decipher or discern (the meaning of symbols, statements, etc.)

Each statement could be unpacked in the general theory.

to remove a pack or load from (a horse, vehicle, etc.).

to remove the contents of a container.