So discard any leftovers. An insulated lunch box will keep cold foods cold and hot foods hot. When packing lunches, don't forget to include either gel packs or other cold items, such as fruit or small, frozen juice packs. Include these for cold food, even though the lun ch box is insulated. Brown paper bags and plastic lunch bags are OK, but don't work as well as an insulated lunch box.
Bags tend to become soggy or leak as cold foods thaw.
Freezer gel packs also cause additional moisture as they melt. Using an extra paper or plast ic bag to create a double layer will help solve the problem. Whether your students use a lunch box, paper or plastic bag, tell them to keep their lunches in a cool place in the classroom, out of direct sunlight and away from radiators. An insulated bottle holds the heat in hot foods, such as soup, chili or stew. Tell your student to keep it closed until lunch time so the food will stay hot.