4801NBLR The sleek, bounce-free Nathan Phantom Pak BlackLight features a super convenient weather-resistant pocket to keep valuables secure and protected. The fully adjustable, elasticized limited-stretch belt provides a secure fit that won't restrict your movement. With the addition of BlackLight reflective fabric, amazing visibility will keep you safer during low-light runs. Zippered, pleated pocket fits smart phones, keys, money, and other essentials. Secure closure offers a bounce-free wear. Expandable pocket.