New, Unused COOTIE / Nylon Backpack Nylon Backpack 【Color】Black, Gray 【Size】Free 【Material】 Nylon This is the COOTIE "Nylon Backpack". The Nylon Backpack uses high-density nylon with a unique luster. It's a large-capacity backpack with a wide opening, making it easy to take out your luggage. It comes with many pockets and is highly practical.