Cotton/polyester. Black night colour 67% cotton / 20% polyester / 3% other fibers. Ecume and Pebble Grey colors 75% cotton / 22% polyester / 3% other fibers. Backpack made of recycled cotton and recycled polyester. The 4-cm wide shoulder straps are designed for extra comfort. The bag features a large main compartment with a zipped front pocket and an anti-theft zipped back pocket, located on the lower back for maximum comfort.