1. The lunch box is made of high-quality nylon and SBS zipper. The lunch box uses high-quality SBS zipper, which is convenient for children to use. Printed with a variety of vivid and interesting patterns, it makes children's childhood full of joy. This durable lunch bag can be used in various occasions such as school, home, park, etc. 2. Insulated and safe: The lunch bag is made of thickened PEVA insulation lining and sponge, which is non-toxic and BPA-free. This lunch box can keep food and drinks at a constant temperature for up to 16 hours. 3. Expandable and foldable: With a reinforced zipper, the top compartment of the expandable lunch box can be easily expanded by a simple zipper operation. The original size is 12.48.53.7 inches (length, width and height), which can store 6 liters. The expandable size is 12.48.55.7 inches (length, width and height), which can store 9 liters, which can meet the different storage needs of children. 4. Multi-pockets: There are two retractable mesh pockets on both sides of the lunch box, which is suitable for boys and girls and can accommodate towels or small water bottles. The reusable lunch bag has two pockets on the front and back, the front pocket can hold children's cutlery, and the back pocket can hold keys, toys, notebooks, etc. There is a zippered mesh pocket inside the bag for snacks.