3 things you should never store in a thermos

3. Chunky Soups or Solid-Filled Foods

While it’s tempting to carry a hot bowl of soup in your thermos, not all are designed to handle solid foods like vegetables, pasta, or rice.

These can clog the lid mechanism, leave behind difficult-to-clean residue, and, when sealed hot, create internal pressure that could damage the container.

Tip: For soups, choose a thermos built for food—one with a wide mouth and pressure-release feature.

How to Keep Your Thermos in Top Condition

To make sure your thermos stays effective and clean, follow these simple maintenance practices:

• Clean it after every use, especially if you’ve stored sugary, dairy-based, or food-containing liquids. Use hot water with a splash of vinegar or a bit of baking soda to clean and deodorize gently.
• Dry it thoroughly before storing by leaving it open for a few hours. This prevents mold and lingering odors from forming inside.
• Don’t put it in the dishwasher unless the manufacturer specifically says it’s safe. Dishwashers can damage the insulation and reduce its performance.
• Protect it from drops and impacts, which can compromise the internal vacuum seal and reduce its ability to retain heat or cold.

A thermos can be a trusted everyday item—but only with the right care and smart usage. By avoiding milk, acidic juices, and chunky soups, and practicing regular maintenance, your thermos can continue serving you well through countless coffee breaks and chilly mornings.