The Medela Breast Milk Collection and Storage Bottles with Solid Lids come in a pack of 6 with each bottle holding 5oz of milk. These bottles are designed specifically for breastfeeding and nursing mothers to collect and store breast milk. The solid lids provide a secure seal to prevent leakage and contamination, making them a convenient and safe option for milk storage. The trusted Medela brand ensures quality and reliability for mothers looking to efficiently collect and store their breast milk.