The bottle bags are made of that are environmental. They can hold a milk bottle. With hand straps and convenient straps with clips, can be used for hanging on bag or buggy or stroller. They can keep a made milk warm for hours. If you have any milk leaks, you can use quick wipe to clean them easily. Features - Color: Grey -Material:Polyester, metal, plastic, aluminum foil - Size: 25.00X12.50X8.00cm/9.82X4.91X3.14in -Note:It can hold 350ML bottle. -They extremely belong to exclusive bottle bags that can save of troubles for mother. -They can be hung on the trolley, stored in backpack. They are so portable that mommy can carry them easily. -They are very convenient and practical, because the can drink hot milk in time even when traveling. -They are useful nursing bottle pouches, and will be used at many times in daily life. Therefore, they are so easy to clean for mothers. -The inside is insulated aluminum foil, which keeps the bottle warm or four hours. Package list: 1 x Bottle Bag 1 x Lock