Dry it before you store it

The smell in your lunch box is trapped moisture and bacteria, so the fix is drying it completely before you put it away.

The smell isn’t the food. It’s water. Not visible water — the thin film of moisture that hides in the lid seam and the rubber gasket after you wash it. Seal that in a closed box for a few days and bacteria have a little spa day. That’s the smell.

So the routine: wash it with hot soapy water and actually scrub the gasket — that’s where last week’s soup is still living. Then rinse with a splash of white vinegar to kill the mildew odor. Then the part everyone skips: dry it fully. Leave the lid off on the dish rack for a few hours, or towel it dry. Store it with the lid off or cracked, never sealed.

For long-term storage, toss in a small open box of baking soda or a charcoal sachet before you close it. Cheap, and it absorbs whatever’s still hanging around.

Your future sandwich deserves a box that smells like nothing.