A container vessel (6)

I believe the answer is:

packet

I believe this is a double definition.

'a container' is the first definition.
(packet is a kind of container)

'vessel' is the second definition.
(packet is a kind of vessel)

(Other definitions for packet that I've seen before include "Container - ship" , "Small fortune - carton" , "Mailboat; item of mail" , "Paper/cardboard container" , "Mail ship" .)

I've seen this clue in the Evening Standard.

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