origin of 'sad sack' (an inept blundering person)

USA, 1942, Army slang—popularised in the Army weekly ‘Yank’ by ‘The Sad Sack’, a cartoon strip by George Baker, depicting the misfortunes of an inept private

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George Baker and the Sad Sack - The Comics Journal

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Sad Sack - Wikipedia

Sad Sack - Wikipedia

Sad Sack - Wikipedia

George Baker and the Sad Sack - The Comics Journal