Stone Island realigns with Yoshida Porter this season for another take on the rugged 30 Litre rucksack. Coming off last years nylon metal series to ring in Porter's 80th year anniversary, this hidden reflective capsule is a strong follow up. Previously seen on a their flagship down vest and down bomber jacket last winter, the opaque black coated canvas features a composition of thousands of glass microspheres, which with wear, will illuminate subtle shades of emerald through the black quartz shell when hit with a spotlight or flash. I've been looking to upgrade my travel bag for sometime now and this is a definitely a front runner. The capsule just released on Stone Island's webstore and includes this rucksack, a helmet bag, briefcase and laptop bag.