The inside of the bag uses a special fabric to maintain a certain temperature. It can be folded compactly, making it convenient to carry. Size: When in use: Approximately 42 x 50 x 7cm (depth) When stored: Approximately 5 x 19 x 5cm (thickness) Weight: Approximately 100g Material: Polyester Please refrain from purchasing if you are concerned about home storage or are particularly sensitive to condition.