Features: Food Grade Material: lunch box set is made of premium quality food grade safety PP plastic (external) and durable 304 stainless steel (internal), BPA-free, no rust, no smell, so you can use without any worries. Health and safety, unique design, fresh and elegant style, suitable for both men and women. Keep Food Warm:Warm lunch box inner stainless steel bottom with PU foam filling design, longer insulation time, can provide 3-4 hours of insulation effect. Before use, it is recommended to moisten and preheat the inside and outside of the bento box with hot water. After the food is cooked, it is recommended to put it into the bento box immediately and then put it into the insulated bag (do not wait for the bento box to be all packed) Lunch Bag Included: with insulated lunch bag, enhanced insulation, very convenient to carry. Convenient for you to enjoy delicious homemade food at work or on the go. Great for storing soups, fried rice, pasta or other hot foods; can also be used to store cold foods such as salads, fruits, etc. Leak-proof and Convenient Design: each bento lunch box comes with a double silicone seal to lock in freshness, air leaks and odors. Clamshell exhaust valve at the top of the lid, hot air can be discharged at any time, making it more convenient to open the lunch box; handle at the top of the lid for easy carrying and moving, and can be reset after use. The double heat insulation layer design of the lunch box allows you to enjoy the food at any time and hold it in your hand without the feeling of heat. Free Combination:Stainless steel insulated lunch box set with stackable design can be freely combined and stored separately to retain the original taste of food and make life more enjoyable and exquisite.2 sizes are convenient for storing different foods, perfect for adults to work, exercise, camping and travel. Specification: Material: PP+Stainless steel Capacity: 510ml/680ml Notes: 1. The real color of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness. 2. Please allow slight manual measurement deviation for the data.