The large main compartment closes with a nylon zipper. There is also a front nylon zipper pocket and an open front. Our fanny pack is a standard, full-sized fanny pack. It features a top nylon zipper compartment with plenty of storage space and front zipper pocket. The webbing strap is fully adjustable. The belt bag and fanny pack are made of tough, durable nylon. Measures 10 1/2" x 4 1/2" x 4 1/2.