Sir — Children nowadays are getting irreversible back problems because of heavy school bags behind their backs. It causes fatigue and reduces the child’s concentration level. Since only some portions of the textbook are taught at a time, individual topics can be published as smaller booklets. This will mean that kids only have to carry the required booklets for the topic being taught. Schools can also provide lockers to students where they can keep their books so that they don’t have to carry them back and forth.