Asj99 via eBay offers this Thermal Waterproof Lunch Bag in five colors (Red pictured) for $2.09 with free shipping. Outside of other eBay sellers, that's the lowest total price we could find by $2. It measures 10.8" x 3.4" x 9.2" and features aluminum insulation to keep food hot or cold.

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Note: Allow up to three weeks for delivery.