Description: 【Quality and Water Resistant】: Made from wear resistant, splashproof nylon material, this backpack is designed to withstand many weather conditions, allowing you to travel freely without fear of rain or wind 【Large Capacity】: The backpack has a large main compartment and multiple storage pockets for organized storage of various items. It has a 2L capacity water bladder 【With 2L Hydration Bladder】: The backpack accommodates a hands free quick drinking water bladder that allows you to hydrate at any time, making it suitable for various outdoor activities 【Comfortable and Breathable】: The comfortable breathable back carrying system features a breathable mesh cloth on the back to prevent stuffiness during exercise, keeping you cool at all times 【Reflective Design for Security】: Designed with reflective strips on the bag for security nighttime travel or running Specification: Material: Nylon Size Chart: Hydration Backpack: 36cmx23cm/14.17inchx9.06inch, Suitable for men and women under 90kg Package Includes: 1 Hydration Backpack 1 Water Bladder Note: Please allow slightly errors 1-2cm differences due to manual measurement.