LOCK DESIGN: There is a safety lock design on both sides of the lunch box, which can be fastened with one click. So there is no need to worry that the lunch box will loosen. Home & Garden/Home Kitchen/Categories/Cooking Dining/Kitchen Storage Organisation/Food Storage/Food Carriers/Lunch Boxes WITH VENT HOLES: Using the principle of pressure cooker, the detachable vent hole can be sealed by pressing it. When opening the lid, you must first open the vent hole on the top to open the lid. FOOD GRADE MATERIAL: The inner liner of the lunch box is made of food grade 304 double layer stainless steel, anti rust, safe . The mirror surface is highly polished, which is easy to clean. PORTABLE BENTO BOX: With arched handle design, the food container is more comfortable, which is easy to carry. It also can be pressed in and out when not in use. The design is exquisite and generous, and it does not take up space. EXCELLENT SEALED: Silicone sealing ring inside, which is thickened and widened, and is connected with the plastic as a whole, not easy to fall off, and has better sealing and heat preservation effects.