Containers for liquid, thermos say (6)

I believe the answer is:

flasks

(Other definitions for flasks that I've seen before include "Narrow-necked bottles, thermos or vacuum" , "Bottles with narrow necks" , "Glass containers" , "Narrow-necked bottles, may be of vacuum type" , "Containers for liquid, thermos say" .)

I've seen this clue in The Irish Times.

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