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After class finishes, children go home after school in the evening when the sky is over cast. They are easily neglected by the drivers and this may result in risks. The core of this design concept is to utilize the refraction of light in transparent objects so as to increase the area of the light source and enhance the illumination. The transparent backpack is combined with a LED light. After turning on the light, the entire backpack becomes an illumination device, which is beneficial for the drivers to notice the children. This LED light is removable and can be disassembled to serve as a single illumination device.