Food Grade Material , Safe and Durable – This stackable bento lunch box is made from food grade safe PP (outer) and durable 304 stainless steel (inner), BPA and phlalate free, you can enjoy your meal without worry; You can bring it to work, school, gym, picnic, camping, etc.【Keep Food Warm or Cold】 - This thermal lunch box usually can keep food warm or cold for 2-3 hours,with the insulated lunch bag can keep for 3-4 hours. This will maintain temperature longer than lunch boxes with no insulation but does not provide thermoses-like warming;【Lunch Bag and Tableware Set Included】The insulated lunch bag is made of fashionable oxford fabric exterior and food-grade aluminum foil interior, which not only enhances the heat preservation time of the lunch box, but also makes it easy to carry. A free portable flatware set is also provided, which can be put into the lunch bag with the lunch box; this travel-friendly lunch box set to let you pack fresh fruit, vegetables, sandwiches, snacks, wraps, and more;Heavy-Duty Leak-proof insulated container – Each layer has a separate lid with the sealed silicone ring that prevents the spillage of sauces, salads and soups; Along with a sturdy leakproof design and easy-open latches for small hands these bento boxes for adult & kids lunches are insulated in both the lid and box to help maintain temperature;STACKABLE DESIGN- The stainless steel lunch box is designed to be stacked, you could freely combine them into 1, 2 or 3 layers lunch box to facilitate the storage of different amounts of food; Pack your main course, fresh salad, fruits, carrots or any snacks in the stackable lunch box suitable for kids to school, adults to work, exercise, camping and travel;