New, Unused Color: Black [Lightweight 125g, No Fatigue] Feeling the weight on your shoulders and back during long runs can be bothersome. This hydration backpack boasts an incredibly lightweight design, weighing only 125g. It's so light, you'll almost forget you're wearing it, providing comfortable support for everything from mountain trails to city marathons. [3D Honeycomb Mesh for Zero Stuffiness] The discomfort of a sweaty back is the enemy of exercise. The 3D breathable mesh promotes airflow, completely blocking the sauna-like stuffiness, whether you're running on a hot road, cycling uphill, or hiking on a summer day. [Professional-Grade Hydration Integration System] Tired of struggling to access your water bladder, snacks, and phone? This backpack solves that problem! The independent layer inside the main compartment securely holds a 1.5L water bladder, and the upper small pocket allows for quick access to gels and your smartphone. [Reflective Design for Nighttime Safety] Poor visibility during early morning runs is a serious risk. High-intensity reflective tape strongly reflects car headlights, clearly illuminating the runner's silhouette even in the dark.