Not sure about bags, but I knew someone who took a college gym class or two with Alex Karras, and he said that he and Karras were the only two guys who couldn't climb a rope to "save our ass" (as it was phrased).
FWIW, he also said that - for a university jock - Alex was a pretty good guy.
I occasionally worked with Karras on Monday Night Football; just a naturally funny guy! If you asked him the time he could make you laugh. Blazing Saddles was a good depiction for Karras! 😂