Used only once, but selling because my child didn't like it. 3COINS (3CO) Cooling Gel Pad for School Backpack - Black Will be folded in half for shipping. ● Keeps your back cool when wearing a school backpack, perfect for staying cool on the way to and from school. ● Semi-solid gel prevents leaks. ● Easy to attach with Velcro. ● Simple design that works with any school backpack design.