Description: 【Lightweight and Comfortable Design】: This outdoor hiking vest backpack is crafted with a lightweight design, ensuring comfort during your activities. The breathable mesh fabric allows for quick sweat evaporation, keeping you cool and dry on the go 【Adjustable Fit for All Body Types】: With its adjustable straps, this backpack can be tailored to fit different body sizes comfortably. The stable cinching system ensures a snug fit that minimizes movement during intense activities 【Ample Storage Capacity】: Featuring multiple storage compartments, this backpack offers ample space to organize your essentials like phones, keys, and wallets efficiently. Its large capacity makes it great for carrying all your necessary items without feeling bulky 【Dedicated Hydration Compartment】: Equipped with a special water bladder compartment that allows easy single handed hydration access without interrupting your pace, ideal for staying hydrated during long hikes or runs 【Enhanced Safety Features】: Designed with fluorescent reflective strips to enhance visibility during night runs or low light conditions, ensuring you stay safe while enjoying outdoor adventures at any time of day or night Specification: Material: Nylon Size Chart: Vest Length: 40cm/15.75inch Package Includes: 1 Hydration Vest Note: Please allow slightly errors 1-2cm/0.39-0.79inch differences due to manual measurement.