This is an eco-bag with a tunnel design from the Tokyo Metropolitan Sewerage Service. I believe the material is non-woven fabric. It has a gusset of about 6 cm, but it's not large enough to be used as a shopping bag. The ruler is for reference. - Design: Tunnel illustration on the front - Back design: Cityscape illustration Not for sale, it was distributed at a Sewerage Service event. It will be folded for shipping. Please refrain from purchasing if you are sensitive to minor imperfections.