Place the container in the freezer for a few minutes or fill it with ice water before adding your meal. 2. Minimize "Headspace" Air is the enemy of temperature retention.

Most high-end vacuum-insulated containers are dishwasher safe, but check for a "Dishwasher Safe" logo on the bottom.

Fill your container as close to the top as possible to reduce the amount of air trapped inside. 3. Use the Right Lid

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