Let your sandwich cool down before you pack it

Most lunch-box sogginess is condensation, and the fix is as simple as letting the sandwich cool to room temperature before you close the lid.

The science is boring but real: warm bread releases moisture, that moisture hits the cooler lid and walls of the box, and then it drips back down onto your sandwich. Give it 15 minutes on the counter and you eliminate most of the problem.

Two more tricks worth stealing:

• Butter or mayo both slices of bread. It’s not just for flavor — fat acts as a moisture barrier between the bread and whatever wet stuff is inside.
• Throw a paper towel in the box. It absorbs the humidity that would otherwise settle on the bread. Bonus: keep your greens on the side and assemble at lunch if you’re really fighting the clock.

One thing that doesn’t work: blaming the container. An airtight box actually makes it worse because there’s nowhere for the moisture to go.

Cool it down, seal it up, and eat a sandwich that doesn’t taste like a wet sponge.