Brand: Master-Piece Series: Density The main body material uses two types of nylon fabric with different sheens, giving it a deep color. The attached leather parts (straps, bottom, around the zippers) use cow leather that has been combination-tanned, oil-treated, and dyed, providing suppleness and depth of color. It has multiple pockets on the front and inside, making it highly functional. My son used it for a short time.