The Titan Deep Freeze® Expandable Lunch Box gives double capacity when expanded and up to 6 hours of fridge cold performance. Included are 2 high performance Ice Walls® that together with SuperFoam® insulation, Therma-Flect® radiant barrier and leak proof lining provide enhanced cooling to keep food and drink fridge cold (4.4°C/40°F) for up to 6 hours. Insulated and Expandable Lunch Packs Includes Leak Proof Container Set High Performance Ice Walls