Nathan Lightweight Light Blue Yellow Hydration Waist With Bottle for Runners The Nathan Lightweight Light Blue Yellow Hydration Waist Pack is designed for runners who prioritize both style and functionality. With a sleek black and yellow color scheme, this waist pack is not only eye-catching but also practical, weighing only 18 ounces. The included water bottle holds 18 ounces of hydration, making it perfect for keeping you hydrated during your runs. The Nathan brand is known for its quality products, ensuring that this hydration waist pack is both durable and reliable for your fitness needs.