Enter Winnipeg inventor Harry Wasylyk who, after the Second World War, began experimenting with a new material called polyethylene. Harry made his first plastic bags in his kitchen and supplied them to the Winnipeg General Hospital to line their garbage cans. He quickly moved his kitchen production to a plant. Around the same time, Larry Hanson, an employee at Lindsay, Ontario's Union Carbide plant began to make garbage bags to use around the plant. Union Carbide knew a great idea when it saw one. The company bought Wasylyk's business and began producing the garbage bags from the leftover polyethylene resin piling up at its Montréal plant. Another Canadian, Frank Plomp of Toronto was also working on the same idea in the 1950s. He sold his garbage bags to hospitals and offices. Three inventors working on the same idea at roughly the same idea, and all of them Canadian!
Bowers, Vivien. Only in Canada!: from the Colossal to the Kooky. Toronto: Owl Books, 2002.
Garbage Bag