To have a school bag that hardly lessens the storage ability giving a sense of stability at a normal time and can instantly exhibit the disaster prevention function by simple operation in a time of disaster, in addition, that has a shape that can easily return the school bag to the normal state even after using the disaster prevention function repeatedly.

The school bag has a shape allowing a user to wear the school bag itself over his or her head by attaching or integrating a buffer material like a plastic plate at a part or all over the parts of a side piece and a cover flap in the time of disaster. It also has a shape allowing a user to wear the cover over his or her head in the time of disaster by extending and manufacturing the cover flap that covers the main storage part to the length that covers the bottom piece and by attaching or integrating splicers of a plurality of buffer materials into a strip inside the cover flap. It can protect his or her head from a shock of a falling article or the like by wearing the school bag with these functions in the time of disaster.