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Recording device in jet pack (5,3)

Ross

I believe the answer is:

black box

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'recording device' is the definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Perhaps they are linked in a way I don't understand?

'jet pack' is the wordplay.
'jet' becomes 'black' (similar in meaning).
'pack' becomes 'box' (I can't explain this - if you can you should give a lot more credence to this answer).
'black'+'box'='BLACK BOX'

'in' acts as a link.

Can you help me to learn more?

(Other definitions for black box that I've seen before include "Flight data recorder" , "Electronic device in aircraft recording flight information" , "Aircraft's flight recorder" , "item revealing how Jumbo killed people?" , "Plane's flight recorder" .)

I've seen this clue in The Sun and The Times.
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