Located in Ichikawamisato, Yamanashi, which boasts a 1000-year history of making paper, the traditional Japanese paper (washi) maker ONAO and famed industrial designer Naoto Fukasawa have collaborated to create the SIWA series of accessories.

Using Naoron - a hard-to-tear paper specially developed by ONAO - Fukasawa discerned that the special texture of Naoron emerged when the paper was crumpled, and suggested designs for everyday goods that harnessed this.

The name SIWA is a play on the word washi (wasi) and a word meaning "crinkle" in Japanese. As with leather goods, these washi products are lovingly, individually crafted.