<P> American and European patent applications relating to the production of plastic shopping bags can be found dating back to the early 1950s, but these refer to composite constructions with handles fixed to the bag in a secondary manufacturing process . The modern lightweight shopping bag is the invention of Swedish engineer Sten Gustaf Thulin . In the early 1960s, Thulin developed a method of forming a simple one - piece bag by folding, welding and die - cutting a flat tube of plastic for the packaging company Celloplast of Norrköping, Sweden . Thulin's design produced a simple, strong bag with a high load - carrying capacity, and was patented worldwide by Celloplast in 1965 . </P> <P> Celloplast was a well - established producer of cellulose film and a pioneer in plastics processing . The company's patent position gave it a virtual monopoly on plastic shopping bag production, and the company set up manufacturing plants across Europe and in the US . However, other companies saw the attraction of the bag, too, and the US petrochemicals group Mobil overturned Celloplast's US patent in 1977 . </P> <P> The Dixie Bag Company of College Park, Georgia, owned and operated by Jack W. McBride, was one of the first companies to exploit this new opportunity to bring convenient products to all major shopping stores . The Dixie Bag Company, along with similar firms such as Houston Poly Bag and Capitol Poly, was instrumental in the manufacturing, marketing and perfecting of plastic bags in the 1980s . Kroger, a Cincinnati - based grocery chain, began to replace its paper shopping bags with plastic bags in 1982, and was soon followed by its rival, Safeway . </P> <P> Without its plastic bag monopoly, Celloplast's business went into decline, and the company was split up during the 1990s . The Norrköping site remains a plastics production site, however, and is now the headquarters of Miljösäck, a manufacturer of waste sacks manufactured from recycled polyethylene . </P>

When did grocery stores start using plastic bags