This Tank Top Bag easily adjusts to fit securely on ATV's. The tank top position is great for keeping gear close at hand, inside the large padded and lined compartment. It's constructed of rugged 600-denier water-resistant polyester pack cloth and equipped with deluxe double zipper pulls. There's a clear vinyl map pocket on top. The smooth bottom material won't scratch paint. It's easy to install or remove in seconds. One size fits most ATV's.