THE CLOWNFISH POSO Water Resistant Unisex Business Travel Student 15.6 inch Laptop Backpack Packsack school bag luxury travel backpack (GREY) PREMIUM MATERIAL: This stylish attractive backpack is made of high quality, wear-resistant, water resistant Nylon fabric. For the inner lining, we use soft feel polyester fabric. The metal fittings, zipper and plastic buckles used are of premium quality.