The entire storage box very strong. Each collapsible storage bin is made of high-quality thickened fabric and non-woven fabric; the interior layer is nested by non-woven fabric, the exterior surrounding is made of robust rigid cardboard, the bottom is thickened cardboard, and the sides are matched with cotton. The reinforced grip makes it easy to move or carry. These storage boxes have enough space to help organize and store a range of items such as cutlery, clothes and toys. 1 location includes the shipping cost to US. Orders of 300 pieces or greater are eligible for sea shipping. 100% guarantee for quality. Rush Service.