happy sack
n.—Gloss: an air-sickness bag of the kind typically used on airplanes. «Silberberg has been collecting the bags—also known as motion-sickness bags, or happy sacks—since he was in college. He got his first bag on a United Airlines flight in 1981.» —“To each, his own bag” by Emily Sweeney in Hull Boston Globe (Massachusetts) Jan. 3, 2008. (source: Double-Tongued Dictionary)