Recommended for people who often eat cup noodles? At Daiso, a 100-yen shop, I found a product called "just put a plastic wrap lid".
Silicone rubber lid made for round containers such as mugs and bowls. There are multiple sizes, and the author purchased two types, "supports up to 10 cm in diameter" and "supports up to 14 cm in diameter".
When you put it on the container and press the handle in the middle, it sticks to the entire edge. It doesn't seem to be completely sealed, but it is useful when you want to temporarily store food or remove dust.
It goes well with not only tableware such as mugs but also cup noodle containers. You can also use it when you want to put a little lid on the noodles or when you want to add weight when you put the noodles back in hot water. If powder such as seasoning is attached to the edge of the container, it may not close properly. Wipe it off and clean it before putting it on.
Although it is not compatible with long-term storage, it can be used in a microwave oven or freezer, and it seems to be useful. Why don't you put one or two cards on standby at home or at work? The price is 108 yen (tax included) each.