Annie Lee said: "It's Feed Bag because Feed Sack sounds like something Trinity would WEAR."
Hey, I've WORN feed sack clothes. My grandma used to have a bunch of layin' hens and sold eggs to the local grocery store in town. I can (sometimes - on a good day
) remember when I was a little guy and came to spend time with my grandparents in the summer. The chicken feed she bought came in cloth sacks (seems like they were 40-50 lbs) that had all different kinds of floral designs, etc. on them, and when empty, she would make table cloths, napkins, or accasionally make me shirts. Those were "feed sacks". My grandpa raised sheep, goats and some cattle, and was also a subsistence farmer, doing all of his plowing, etc., with a team of horses. He had, and I occasionally saw him use, what he called a feed "bag" or nose "bag". If you want to see what one looks like, see
http://www.feedritebag.com/.