Material: Aluminum 【Size】: Approximately width 22 x depth 13 x height 20cm. It has enough space to hold plenty of items such as lunch boxes, drinks, rice balls, and side dishes. It also has an extra pocket on the outside for storing small necessities like napkins, mobile phones, wallets, keys, and tableware. It looks small, but it can hold plenty of drinks, sandwiches, vegetables, fruits, etc., and has surprisingly large storage capacity! 【Material Description】: The lunch bag is made of high-density Oxford cloth and thick aluminum foil. It can keep your food cool or warm for about 4 hours. It keeps your food fresh and delicious. It's even fresher when frozen with an ice pack. 【Portable and Convenient Storage】: It's a handbag-style bag with an elegant shape and a design that exudes sophistication, making it easy to carry. When not in use, it can be folded up compactly, saving space in your backpack or office. 【Waterproof and Moisture-proof】: The insulated lunch bag has an environmentally friendly aluminum sheet lining that is soft, leak-proof, and insulated. The lunch bag excels at keeping drinks cold and lunches warm. The simple lunch bag has enough capacity to hold lunch for more than one person. 【Multi-purpose】: It's an insulated lunch bag with a thick and durable aluminum sheet structure inside. Cool in the summer and warm in the winter. Convenient for carrying lunch boxes and drinks. The design has cushioning to stabilize the contents. With a simple design and calm colors, it can be used by the whole family, regardless of gender.