Lining with Eco-friendly PEVA aluminum foil material, interior padded with thick insulation pearl foam, protect with oxford outer fabric. Can keep food stay cold/warm/fresh for 5 hours. Double deck lunch bag (10.2" x 6.7" x 9.4") is designed for maximum storage efficiency, 1 main zipped compartment, 1 front zippered pocket, 2 mesh pockets and 1 internal mesh pocket, not only provides you with plenty of space to pack all of your food and snacks , as well as pack your keys, cards, phone chargers, napkins, water bottles, utensils, other small stuffs you daily needs.