Porter-Yoshida & Co. - Porter-Yoshida & Co.'s black Howl backpack is made from robust nylon twill, a material that the label developed in-house has been using to create its utilitarian accessories since the 1960s. It's crafted in Japan to a compact silhouette, with multiple pockets for effortless organisation and adjustable straps that can be worn on both shoulders or as a crossbody.