SIWA's string & button envelopes add innovation to the nostalgic style. These durable envelopes feature soft Naoron paper, which is rip-proof, water resistant, and can carry up to 22 lbs of weight. The string & button style can carry large magazines or up to 500 sheets of paper by opening the bottom gusset. To increase the strength, the envelope has double seams and a double-layer of material.
Onao paper company is a family-owned company based in Japan. With over 150 years of experience in paper-making, the company continues to create innovative products in Yamanishi, a rural area near Mt. Fuji.