This lightweight backpack is perfect for all activities, including running, cycling, mountain climbing, and hiking! Its slim design fits the body, allowing for easy movement and comfortable running! Product Features: ・Lightweight & Comfortable Fit: The design closely conforms to the body, minimizing bounce and providing stress-free use even for extended periods. ・Highly Breathable Mesh Structure: The back and shoulder areas are made of mesh material, preventing stuffiness even when sweating. ・Water-Repellent Material: Protects your belongings from light rain and sweat. ・Reflective Logo: Provides safety during nighttime running and cycling. ・Excellent Storage Capacity: Can securely store smartphones, water bottles, energy gels, and more. Product Information: Body Color: Black Material: Nylon Country of Origin: China Water bag not included. This unisex design is suitable for all genders and is recommended for everyday jogging, trail running, and commuting by bike.