Every school day, we use schoolbags to carry all of our things to school. They are a big part of our lives. But have you ever thought about the history of the schoolbag?
In the Han Dynasty, students used bamboo boxes to carry books to school. People consider the bamboo boxes to be the earliest schoolbags. They were usually two or three layers（层） in the box. Kids put different things like books, brushes, ink stones（砚） and paper in the boxes.
Hundreds of years later, people developed a new kind of schoolbag called the budai, or the "hip-pocket". The budai was lighter than the bamboo box. With the founding（成立） of the People's Republic of China, military rucksacks（军用帆布包） became popular. Many people carried them when they were in school.
A new style of schoolbag has appeared（出现） in recent years. Many of them have colorful designs（设计） on them, such as pictures of cartoons or pop stars. Some students pull wheeled bags with heavy textbooks and others carry backpacks.
Schoolbags are still changing. Can you imagine what future schoolbags will be like?
