’'Bag-holder‘‘ Chair / chair

Bag-hold chair
At school, a student’bag is always hanged on the back of the chair. However, for the edge’s arc is smooth, the bag’s belts always slide down and then the bag falls down too. The situation is also the same with light clothes.
So we get a groove on the back support, firsrly, the groove can prevent the bag’s belts from sliding, secondly, when the clothes are folded to across through the groove of chair’s back, the resistance can be big enough.