Description: 【Double Shoulder Design】: The double shoulder design of the backpack helps distribute weight evenly, reducing your burden and providing you with extra comfort during physical activities. 【Reflective Design】: The backpack has a reflective design that enhances visibility in low light conditions making it for night time activities. 【Breathable】: This bag is made of nylon, known for its breathability and durability, making it ideal for outdoor activities like running, or hiking. 【Adjustable and Versatile】: It features an adjustable chest system that can be quickly disassembled and adjusted for tightness making it easy to use. 【Wide Application】: Outdoor backpack is suitable for various outdoor activities such as mountain climbing, hiking, and more. It's an ideal choice for outdoor sports enthusiasts. Specification: Material: Nylon Size Chart: 43cmx23cmx9cm/16.93inchx9.06inchx3.54inch Note: Please allow slightly errors 1-2cm differences due to manual measurement.