NIKE Trail Kiger Vest, Medium, (Black/Total Crimson) Nylon/Polyester Imported Large main compartment fits hydration bladder (sold separately) or can be used for additional storage Mesh shoulder straps and back panel for breathability and comfort. Multiple stretch mesh pockets for easy access storage Zippered dry zone compartment for secure storage Dual, adjustable sternum straps for a customized, stable fit Reflective detailing for enhanced visibility in low light conditions. Capacity 3.5L. Weight 9.5oz