In search of the perfect waist pack, White Mountaineering designer Yosuke Aizawa looked no further than the common tool pouch carried by construction workers. Its perfect proportions, however, needed a few improvements. In place of the common cowhide, Aizawa opted for supple calf leather instead. And to ensure no discoloration came with wear, the soft hide were selected accordingly through its natural color from brown or black cattle breed. Next, the designer tapped the best bag manufacturer in Tokyo, the folks from PORTER, to realized his ambitions. When finished, the Leather Waist Pack from White Mountaineering, PORTER and retailer B Jirushi Yoshida achieved the aesthetics of traditional leatherware yet strike a balance with modern functions. Seamless zip enclosure, along with ample spaced compartments, store pens, notepad and delicate, like cellphone and camera. Comes in brown and black suede, now available at BEAMS retail locations across Japan.