With the Medium School Backpack Jurassic Park 30 years M, classes are more fun! It is practical, resistant and safe, perfect for storing your favorite books, notebooks and supplies. It's made of polyester, it has two large-capacity compartments, a bottle-holder pocket so you can always carry your favorite drinks, an internal organizer pocket for pencils, a micro-injected key ring, and S-shaped padded straps that give you greater comfort.