Lightweight Design: The 5-liter race vest (without the hydration pack) weighs only 150 grams/5.29 ounces. It's ultra-light and breathable, effectively reducing your running load and shortening your race time. Designed for medium- and long-distance running.

• Optimal Storage: Multiple pockets accommodate small items such as a thermos, keys, phone, and cash. The strategic layout provides direct access to essentials for maximum convenience.
• Perfect Fit: The ergonomically designed vest-shaped backpack features adjustable shoulder and chest straps for a perfect fit, preventing movement while running. A unique padded back allows for optimal airflow between your back and the backpack. Soft mesh on the back and shoulder straps maximizes breathability.
• Highly Practical: This backpack is suitable not only for running and hiking, but also for nearly any outdoor activity, including running, cycling, camping, and marathons.
• Note: This package only includes the backpack; the optional 1.5-liter hydration reservoir is not included. Please note that this link only includes the backpack, not the hydration reservoir. Thank you!