Feature:1. WIDE MOUTH DESIGN: The wide mouth design of these bottles allows for easy pouring and extraction of breastmilk, making it a convenient option for mothers.2. COMPATIBLE WITH MAJOR BRANDS: With a bottle body diameter of 5.0cm, these bottles are compatible with popular wide mouth brands such as for NUK, for Dr. Brown's.3. LEAK PROOF CAP: Featuring a leak proof cap design, these wide neck breastmilk pump bottles effectively seal in the freshness of breastmilk, ensuring no worry storage.4. VERSATILE USAGE: Suitable for refrigeration, these bottles are great for storing and carrying breastmilk, making it convenient for your baby to have milk anytime, anywhere.5. FOOD GRADE MATERIAL: Made from food grade plastic, these breastmilk storage bottles are safe for use with breastmilk and can be reused multiple times.Specification:Item Type: Milk Storage BottlesMaterial: PlasticSize: Approx. 15.8 x 6.2cm / 6.2 x 2.4inBottle Neck Diameter: Approx. 5cm / 2inCapacity: 300mlApplication: for NUK, for Dr. Brown's wide neck bottles, and domestic electric breastpumps.Package List:8 x Milk Storage Bottles