Yes but make sure it’s not very hot when storing them overnight since this can cause an explosion if not cooked properly . Always check if there is enough liquid (water or broth) inside before leaving food overnight or putting them under hot sun outside . To prevent from exploding use thermos with lid . Put hot foods directly into thermos after they come out from oven , put cold foods directly into thermos after they come out from refrigerator . For long term storage always put them away from heat sources . Keep dry cloth on top , underneath or sides depending on how hot foods are . Also make sure there are no gaps around cover while storing because if they get heated then can cause explosion also check if cover closes tightly . Also use long utensils such as spatulas , spoons etc so it won’t touch sides while removing food , if they do then open cover , remove food by spatula etc after checking all sides again cover up again .