A caring grandpa named Li Chunqiang from a village in north China's Hebei Province has gone viral for making a unique trolley school bag for his grandson. /VCG Photo

The 49-year-old carpenter spent four days making the woodwork as a reward for his grandson's excellent performance in the end-of-term exams last month. /VCG Photo

"Be diligent and study hard" is the message the grandpa wrote on the wooden bag's cover. Li and his son also made Luban stools, sunglasses and a clock that looks like Peppa Pig and other creations. /VCG Photo

Li Chunqiang is the third generation in his family to work as carpenters. "I hope this wooden craft can get young generation's attention to learn and inherit this knowledge," said Li. /VCG Photo