Enhanced Nighttime Visibility: Both men's and women's running backpacks feature highly reflective strips on the front and back, and reflective trim ensures safety at night, while the shoulder strap clips ensure additional strap security.Designed specifically for runners, cyclists, and outdoor sports enthusiasts, this is essential for safety and comfort during low-light training. Ample storage space: This hydration vest is designed with adjustable shoulder straps, allowing you to adjust the tightness to fit your body.The bag has one large pocket with a cross elastic cord and two small pockets.In addition, the right pocket is used to store small water bottles.The left pocket is used to store mobile phones and items, and can accommodate a 1.5-liter water bladder in the main compartment.So you can jog while listening to music! Breathable and lightweight: The Runlight moisturizing vest is made of breathable, lightweight neoprene and features three sizes of ventilation holes to enhance air circulation and moisture wicking.The ventilated mesh cover keeps the back cool by maintaining air circulation, preventing discomfort caused by accumulated heat, and providing excellent airflow and breathability. Hydration: The hydration pack comes with a 1500 ml soft water bladder made of thermoplastic polyurethane (TPU) material.The soft water bag is pressure-resistant and leak-proof, and can be placed in the front elastic pocket for easy access. Just take a light bite and you can drink directly for hands-free hydration without interrupting your pace.Please wash the water bag and place it in a ventilated area for 24 hours. Wide range of applications: Hydration vests can accompany you in running, jogging, mountain climbing, hiking, cycling, walking, backpacking, and camping, etc. The hydration backpack is suitable for both men and women, designed specifically for sports enthusiasts who want to carry water in their backpack. This water bag is also a perfect gift for family and friends who enjoy outdoor activities. If you have any questions, please feel free to contact us