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

Mandy (comics) - Wikiwand

RIVERSIDE: George Baker created Sad Sack – Press Enterprise

The Sad Sack During World War II ~ Vintage Everyday

Mandala #13 - Mandala Madness - Art, Abstract, Soul, Color, Life, Body, Peace, Generative, Love, Dream, Buddha

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

Ernest in his Entirety: a 14,000 Word Guide to the Ernest P. Worrell Films — Nathan Rabin's Happy Place

Hey, ya'll remember when that sad orange sack of shit made the governors compete for ventilators? Can't wait to pee on his headstone. : r/HermanCainAward

One Man And A Thousand Tigers : Colonel Kesri Singh : Free Download, Borrow, and Streaming : Internet Archive

The Era -- Day By Day, Page 400

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

Pitching a Mario Movie by Speedymcfly on DeviantArt

Test selectors

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

Sad Sack: A trip down memory lane