We use Oxford cloth and PVC material for this pen bag, the transparent PVC window can see the items inside, so you can know the items inside without opening the bag, the bag quality is relatively thick, can prevent pencils and other sharp objects from breaking the window, suitable for school and students, the bag can not only hold stationery, but also can hold mobile phones, sewing bags, first aid kits and other small tools. 1 location includes the shipping cost to US. Orders of 2,000 pieces or greater are eligible for sea shipping. 100% guarantee for quality. Rush Service.