The company, based in Isesaki, Gunma Prefecture, decided to commercialize the reconceptualized "randoseru" primary school backpacks -- traditionally made of leather -- because the "formula square bag" for junior high and high school students, which it launched last fall, was so well received. A company representative said, "The market of 'randoseru' school backpacks continues to grow despite the declining birth rate, and we are confident in our ability to balance functionality and price. There are only a few bags left from the initial batch, and after analyzing the customers' responses, new colours and additional production will be considered."