I'm selling this because I no longer use it. There are some signs of wear on the zipper hardware. Other important notes are listed in my profile. Please take a look. [Quoted from ZOZOTOWN] The fabric is highly durable and is a standard material for Cote&Ciel, also used in other products. It's a versatile material that can be used with any clothing or season, and works well for both casual and smart looks. It has ample storage space. The most distinctive feature is its unique form that utilizes architectural curves. It's shaped like a turtle shell, and the curvature allows water to run off even if it gets wet. Also, there are experimental results showing that the curved form is less susceptible to impact than a flat surface, making it a strong structure. The secret pocket is designed to be almost invisible from the surface, making it convenient for storing valuables such as keys and commuter passes. In addition, it fits very well on the back, making it feel lighter and less tiring to wear for long periods. This is a high-end brand of iPhone/iPad/MacBook accessories designed by Paper Rain, the producer of "Damir Doma," a popular brand at Paris Fashion Week. Paper Rain has clients including industry-leading companies and organizations such as Apple, BMW, and FIFA, and is also focusing on research and development of recycled fibers. They also handle everything from the development to the production of world-class products. #CoteCiel #CoteCiel #Isar #Rucksack #Backpack