Most bags today are made out of plastic, and are typically black, white, or green in color.Garbage bags were invented by Canadians Harry Wasylyk, Larry Hansen and Frank Plomp in 1950.The first bags in the United States were green and black, rather than the now-common white and clear.Varying thicknesses are commonly manufactured - thicker bags are used for heavy-duty applications such as construction waste, or in order to be able to withstand being compacted during recycling processes.[6] In July 2004, ForceFlex, the flexible plastic garbage bags, was introduced by GLAD[4] (followed by Hefty's Ultra Flex brand in September).