Building on their existing collaborative efforts, AW16 sees Porter-Yoshida, the Japanese brand symbol of excellence in bags and accessories founded by Yoshida Kaban, once again join forces with Stone Island to produce a capsule collection of technically minded bags. The Hidden Reflective Backpack appears to be an all black design until it meets a flash or direct light, at this point a reflective under layer created from thousands of glass microspheres is revealed. Over time this inner layer will become more apparent, how much so will entirely depend on usage.