New, Unused Color: Black 【Lightweight at 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 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 climbing mountains on a summer day. 【Professional-Grade Hydration Integration System】 Say goodbye to the frustration of mixing water bladders, snacks, and phones, making them difficult to access! 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 smartphones. 【Reflective Design for Nighttime Safety】 Insufficient visibility during early morning runs poses a significant risk. High-intensity reflective tape strongly reflects car headlights, clearly illuminating the runner's silhouette even in the dark. Size...FREE SIZE Size...Up to 10L