These are freezer bags and zip-top bags. Both sizes are M. The freezer bags in the box in the second photo are 20cm x 18cm, and there are 29 left. They can be used for freezing and thawing. You can thaw them in the microwave by opening part of the zipper. Cold resistance: -30 degrees Celsius, Heat resistance: 60 degrees Celsius. They can be thawed, but cannot be used for heating or direct fire. Also, when thawing stews or curries, please thaw them naturally or under running water because the oil content can cause high temperatures. Please check the fourth photo for product details. There are no particularly noticeable stains. The zip-top bags in the third photo are 24cm x 17cm. They can be frozen, but cannot be thawed or heated. They cannot be used in the microwave, oven, etc. (see photo 5). They are convenient for a wide range of uses, such as storing small items and toys. The box is not included. We will not accept price negotiations.