Nathan BlackLight Phantom Running Pak Imported Zipper closure Black reflective fabric is deceivingly super reflective and provides incredible visibility Zippered, pleated weather resistant pocket fits smart phones, keys, money, inhaler and other key essentials Fully adjustable enhanced elasticized limited stretch belt One size fits most (26-44in/66-112 cm Weight is 15 oz./425 g and storage capacity is 16.5cu/027 liters