Porter Yoshida & Co. Tanker Day Pack Backpack in Black. Porter Yoshida & Co present this high quality backpack as part of their bestselling 'Tanker' range. The Japanese company is renound for it's design and manufacturing excellence in bags and accessories, and the Tanker Day Pack is no exception to this. Constructed using Yoshida & Co.'s celebrated three-layer technology, the Day Pack is a traditional backpack design featuring the brand's signature 'Rescue Orange' lining and patch branding to the outer pocket. The Day Pack is perfect for everyday use due to it's guaranteed strength and quality.