New, Unused Color: Black 【Lightweight at 300g, No More Fatigue】 Feeling the weight on your shoulders and back during long runs is bothersome. This hydration pack boasts an incredibly lightweight design, weighing in at just over 300g. 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 hiking on a summer day. 【Professional-Grade Integrated Hydration System】 Say goodbye to the frustration of water bladders, snacks, and phones all mixed together and hard 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】 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. Material... UL/Ultra Light, Waterproof, Water Repellent, Breathable, DCF, Dyneema, Gore-Tex, Tyvek Size... ~10L