This is a mask case collaboration between BOTANIZE and otii. The strap is not included. Only the mask case is available. It has been used very little, but the back side seems to be slightly discolored due to poor storage conditions. There are no problems with the use of the water-stop zipper, etc. This mask case is made of Tyvek, a collaboration with BOTANIZE™, a shop that handles unique caudiciform plants, cacti, and succulents from all over the world. Tyvek is a high-density polyethylene fiber nonwoven fabric developed by the chemical conglomerate DuPont. It has excellent "water resistance," "durability," and "moisture permeability," and is used in chemical protective clothing and house wall materials. It is a lightweight and durable material, used in a variety of fields such as express mail envelopes for postal services, clothing, and the scientific, medical, and agricultural fields. The mask case is a strap-attached pouch that can store masks removed during meals or spare masks. The design is based on the specifications of disposable masks, with a playful design. brand - otii × BOTANIZE color - white material - DUPONT Tyvek® size - ONE SIZE mask case 13 × 21 *Due to the nature of the product, there may be slight individual differences in dimensions and sewing. Thank you for your understanding. Instant purchase is welcome. #ボタナイズ