Come and Check Our Branding Solutions.The inner insulation of the lunch backpack is thickened with foam and works together with the Aluminum layer to keep the food warm but also keep cold drinks about 3-5 hours. Allow you to enjoy delicious food at any time.When you store food or fruit in cooler compartment, main compartment area will be reduced to provide more space for food container compartment. When you don't need to carry food, the insulated layer can be folded so that you can carry more items in the main pocket. It's a combination of lunch bag and laptop backpack, which is stylish, convenient and practical. Pls check inventory and detailed info before placing your orders.