This lunch box's inner tray is made of Tritan material imported from the United States and sealed with silicone. Children's lunch boxes do not contain harmful substances, such as bisphenol A and plasticizers, which are durable and can also be frozen or heated. Easy to clean and open, the 4-compartment children's lunch box fully meets children's appetite and encourages a healthy and balanced diet. Each seal will be locked in each part of the children's lunch box and adult lunch box to ensure that no food is mixed, spilled or leaked to each other. It can effectively prevent odor and make you eat "original flavor". Light and Compact. Our lunchbox measures 21 cm x 16.5 cm x 5 cm and holds 850ml. This sleek, portable lunch box can be used for the whole family, from babies and toddlers to men, women and older children. Perfect for breakfast, lunch and snacks at work, school or for leisure.