Appeared in the mid-20th century, the schoolbag on wheels quickly became part of who small schoolchildren were. The use of this accessory is recommended for primary classes. Furthermore, there are also models suitable for adults. It launches indisputable advantages that respond primarily to practical concerns. In elementary class especially in 4th and 5th grade, students must carry many books and note pads around. While a too heavy backpack causes back problems and even growth problems. Roller binders were then launched to avoid these problems..