Keep your breast milk securely sealed and preserved with Similac® Breast Milk Storage Bottle Caps. Crafted from durable plastic, these 40-mm caps are designed to provide a snug and protective fit on 4-fl-oz breast milk storage bottles, 8-fl-oz plastic bottles, and the Volu-Feed Nurser. Whether you're a new parent or a caregiver, these caps offer a reliable and convenient solution for preserving the purity and freshness of breast milk, ensuring that every precious drop is ready for your baby's nourishment whenever needed.