Many people now bring reusable thermoses to the store to fill with coffee to help keep the java hot and to cut down on disposable cups. You can also use your thermos to keep foods hot longer. Think homemade mac and cheese, soup and other items you can store in an airtight thermos. You can enjoy these hot foods for lunch at work or your kids can take them to school. If the thermos keeps coffee warm, it will also keep food toasty for hours.