These 40ml freezer bags are perfect for storing breast milk. - Brand: Pigeon - Capacity: 40ml - Quantity: 46 sheets - Purpose: For breast milk storage - Packaging: Zippered bag - Accessories: Label stickers The zipper is strong, so it won't leak. The box says it contains 50 sheets, but 4 have been used. *To reduce shipping costs, the bags will be sent without the box. The outer box will be folded. If you have any questions, please leave a comment. Thank you for looking.