Switch to a reusable cooler bag, rather than buy constant disposable versions. The best reusable cooler bags are made from eco-friendly materials, and offer an alternative to plastic wrap. Obviously to keep things cool, they do have some form of insulation, but they provide a way to make your own cool lunch to take with you, rather than buying chilled ready-made sandwiches at the store.
Leon Retro-Style Cooler Bag is washed by hand, the ice ice-pack keeps contents cool for 2 hours. Keep dry ice away from pets and children.