Bottle-opener and drinks in packs (5)

I believe the answer is:

bales

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'packs' is the definition.
The answer and definition can be both man-made objects as well as being plural nouns.
Perhaps there's a link between them I don't understand?

'bottle-opener and drinks' is the wordplay.
'opener' says to take the initial letters.
'and' says to put letters next to each other.
'drinks' becomes 'ales' (ale is a kind of drink).
The initial letter of 'bottle' is 'b'.
'b'+'ales'='BALES'

'in' acts as a link.

Can you help me to learn more?

(Another definition for bales that I've seen is " 'Large bundles, of hay perhaps (5)'".)

I've seen this clue in The Globe and Mail.

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