，但是硬包可能会影响食物的口感。

The best way to keep food warm is to use an insulated container or a thermal bag. This method will help keep the food at a safe temperature without altering its taste or texture. Insulated containers and thermal bags are designed to trap heat, which helps maintain the temperature of the food. They also come in different sizes and shapes, so you can easily find one that fits your needs. Additionally, these containers and bags are often easy to clean and store, making them ideal for keeping food warm for long periods of time.