How does a lunch box with a thermos work?

A lunch box with a thermos is a type of container that helps keep food hot or cold. It usually consists of two parts: an inner container that holds the food, and an outer shell that helps insulate the food. Some lunch boxes also have a built-in shoulder strap or handle for easy carrying.

Lunch boxes with thermoses are great for keeping food at the correct temperature, whether you’re packing a hot meal or a cold one. They can also help prevent spills and leaks, making them ideal for bringing along on picnics, road trips, or any other type of travel.

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