The large and medium bags are made of Neoprene. They are machine washable, so no icky cleanup. The large bag/lunch tote is the perfect size for your kiddo's lunch. The middle bag is sized for those on-the-go cold snacks like baggies of grapes and carrots with a small ice pack. And the smallest bag/coin purse fits all variety of little toys or crayons. And they store flat when empty. The dye sublimation printing process creates slight imperfections that are unique to each item.