NIKE Lean 22 oz Hydration Waistpack (Black/Volt) Nike Lean 22 oz Hydration Waistpack. Adjustable elastic belt makes for customized, secure and comfortable fit during workout Expandable stretch mesh fabrication for customizable storage space Low profile design and secure fit reduces bounce Angled bottle placement for swift removal and replacement Adjustable toggle closure keeps bottle secure during runs Single button buckle closure makes for easy on and off Silent zipper and easy squeeze 6 oz water bottles for minimal distractions Reflective detailing for enhanced visibility in low light conditions