The bags will be available in stores starting May 20.Credit: Courtesy of Trader Joe's / People MagazineWhen Trader Joe's introduces a new food item, it's big news. When the popular grocer launches new tote bags, it's headline-worthy.The chain recently announced that it's launching a new insulated mini tote collection for summer, according to People.The Trader Joe's Summer Fun Mini Insulated Totes, which will hit stores May 20, will be available …