Transports unopened bags by river (8)

I believe the answer is:

raptures

I'm a little stuck... Click here to teach me more about this clue!

'transports' is the definition.
(transport can mean to fascinate or rapture)

'unopened bags by river' is the wordplay.
I cannot quite understand how this works, but
'river' could be 'ure' (River Ure) and 'ure' is found within the answer.
This explanation may well be incorrect...

Can you help me to learn more?

(Another definition for raptures that I've seen is " Expressions of ecstatic joy".)

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

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