More than 90% of children aged 6-12 who use randoseru say the weight is a problem, according to a recent survey by Footmark, a Tokyo-based manufacturer of swimwear for schoolchildren. In a report on the survey of 1,200 parents and their first-, second- and third-grade children, the Yomiuri Shimbun said 93% of pupils thought their bags were too heavy – an opinion shared by 90% of parents. The bags, initially introduced to encourage children to walk to and from school, are made to last pupils through their first six years of compulsory education. But their durability and roomy proportions come at a price. According to the Yomiuri, the average weight of a randoseru filled with books and other paraphernalia is 4.28kg, up from 3.97kg in 2022. Some children struggle with backpacks weighing more than 10kg, the newspaper added. Almost one in four children who mentioned the weight issue complained of shoulder or back pain, while 65% of all respondents said they would like to trade in their randoseru for something lighter. Parental complaints about the items have traditionally centred on their hefty price tag. They cost an average of ¥56,425 (£353/$425) in 2022, according to a survey by the Randoseru Kogyokai industrial association. The price has risen nearly ¥20,000 over the past decade.