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

Principles of Politics Applicable to All Governments

Mandy (comics) - Wikiwand

Nkandla: A Festering Cherry On Top Of Corrupted Rule: ANC Dystopia ~ Technical & Ethical Maladministration and Ineptness - HubPages

The Sad Sack' Comic Strip - A Happy Memory For World War II Veteran

George Baker and the Sad Sack - The Comics Journal

Sad Sack - Alchetron, The Free Social Encyclopedia

The Distributed Proofreaders Canada eBook of The End of the Battle by Evelyn Waugh

Darwin, Francis & Seward, A. C. eds. 1903. More letters of Charles Darwin. A record of his work in a series of hitherto unpublished letters. London: John Murray. Volume 1.

Orion Magazine - Calling All Fanatics

Silver Age Comics: Single Issue Review: Sad Sack #154