Large Capacity and Convenient Design: This outdoor cycling bag has a capacity of approximately 8L, making it your mobile supply station. comfortable to wear during outdoor activities like cycling, running, or hiking.Reflective Design for Safe: The bag is designed with reflective elements to enhance your safe during night time running or cycling activities.Material: Made from lightweight, soft, sturdy, and nylon cloth that is lightweight, comfortable, and resistant to wear and tear.Convenient Design: The backpack features convenient side storage pockets and a top handle strap design for easy carrying by hand when needed, great for long outdoor adventures.Adjustable and Versatile: It features quickly disassembled and adjusted making it easy to use. Hydration Backpack is designed to fit snugly against your back for maximum comfort and flexibility. Specification: Material: Nylon Size Chart: 40cmx22cm/15.75inchx8.66inch Package Includes: 1Hydration Pack (Not Included Water Bladder) 1 Storage Bag Note: Please allow slightly errors 1-2cm differences due to manual measurement.