To separate and remove, as things packed; to open and remove the contents of; as, to unpack a trunk
If you unpack an idea or problem, you analyse it and consider it in detail. A lot of ground has been covered in unpacking the issues central to achieving this market-led strategic change. = analyse
When you unpack a suitcase, box, or similar container, or you unpack the things inside it, you take the things out of the container. He unpacked his bag pack