Twin Call Lunch Pouch Keeps food cold & warm ★ Budgie The inside is made of aluminum to keep the temperature. Suitable for lunch boxes with the following dimensions: Height: within 9cm Width: within 18cm Bottom gusset: within 8.5cm Although it is new and unused, it has been stored at home. Please refrain from purchasing if you are concerned about folding wrinkles. Please purchase with your understanding. ★ If you wish to purchase multiple bird-themed items, please let me know in the comments. Due to size and thickness, we may not be able to combine items, but if we can, we will pack them together. In that case, there will be a discount.