Description: 【Reflective Design】: This outdoor hiking backpack features a lightweight structure design, making it easy to carry during your adventure. The backpack is equipped with reflective strips to increase visibility and safety when running at night, ensuring that you are clearly visible to vehicles 【Efficient Storage】: The hydration vest pack adopts a multi compartment storage system that can be stacked in layers for easy and organized storage. It includes a shoulder key compartment for keys, a side pocket for energy gels and tissues, and a dedicated mobile phone compartment that can accommodate smartphones up to 7 inches 【Hydration Bag Storage】: This outdoor sport bag is equipped with a 500ml water bottle set and comes with a water bag compartment that is compatible with a 500ml water bag, allowing you to easily replenish water during your  【Breathable and comfortable】: This lightweight sport vest bag is made of polyester material and honeycomb mesh fabric to ensure that you stay breathable and dry throughout your 【Adjustable】: This hiking vest backpack is equipped with an adjustable buckle to adapt to various waist circumferences, bringing personalized comfort and sports stability Specification: Material: Polyester   Size Chart: Backpack Length: 40cm/15.75inch Water Bottle: 7cmx20cm/2.76inchx7.87inch Package Includes: 1 Hydration Vest Pack 1 Kettle Note: Please allow slightly errors 1-2cm/0.39-0.79inch differences due to manual measurement.