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

The Sad Sack During World War II ~ Vintage Everyday

Daredevil – Now Read This!

The Sad Sack During World War II ~ Vintage Everyday

Are we a stupid people? By one of them : Weld-Blundell, Charles Joseph : Free Download, Borrow, and Streaming : Internet Archive

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

Sad Sack: The Comic Forcing Us to Think the Unthinkable, by Sewer Mutant

Sad Sack: The Comic Forcing Us to Think the Unthinkable, by Sewer Mutant

Author: Adrian Bonenberger - Wrath-Bearing Tree

Sad Sack - Wikipedia

Sad Sack - Wikipedia

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

Africa at the beginning of the nineteenth century: issues and prospects

RIVERSIDE: George Baker created Sad Sack – Press Enterprise

Today's Energy Crisis Is Very Different from the Energy Crisis of 2005