Nowadays I always want to carry a couple of spare masks with me. However, if you forget to replenish it, it may be useful to have the item "Multi Mask Clip" sold at the 100-yen shop.
Multi-mask clip
The multi-mask clip is a set of two elastic cords with clips on both ends. You can use it as a simple mask by fastening it to the end of a gauze or handkerchief that has been folded to an appropriate size.
The resulting instant mask is flat and has no pleats, so it looks and feels much different than regular masks. There is a tendency to create a gap between the cloth and the face, and it is necessary to hold it by hand to prevent infection. It's an item that can be used as a temporary measure in an emergency, but if you really want to use it, you may want to prepare a cut cloth for the mask.
Handkerchief becomes an instant mask
The price (excluding tax) of the "multi-mask clip" (2P set) is 100 yen. Even if you have a stock of masks for the time being, why not check it out if you see it at 100%? It is a free size, but the size may not fit depending on the person who uses it.