If you cannot find lids for those, you may want to consider something like this
https://www.amazon.com/dp/B01MXYMS1R
If you go to the product page
https://corelle.com/products/corelle-win...iment-bowl
and search reviews for "lid" you see only one person who says they bought lids separately and then a handful of people complaining there are no lids. And older review (2021) says "The salad plates act as a lid when storing food in refrigerator! Love them."
https://www.amazon.com/dp/B01MXYMS1R
If you go to the product page
https://corelle.com/products/corelle-win...iment-bowl
and search reviews for "lid" you see only one person who says they bought lids separately and then a handful of people complaining there are no lids. And older review (2021) says "The salad plates act as a lid when storing food in refrigerator! Love them."