The Medela Breast Milk Collection and Storage Bundle includes 6 leak-proof, 5-ounce BPA-free bottles compatible with Medela breast pumps for directly pumping into storage. It also contains 2 replacement PersonalFit connectors for Pump In Style Advanced and Symphony pumps to customize shield fit. The storage bottles simplify pumping and storing breast milk. Their volume markings help track amounts, while tight lids ensure secure transport and freezing. As Medela parts, the bottles integrate smoothly across Medela pumps with bottles. The dishwasher-safe bottles also sanitize in Medela steam bags. The PersonalFit connectors attach Medela breast shields to pumps for comfortable, efficient pumping sessions. Since shield fit impacts milk expression, the connectors work with Medela's shield sizing system. Their Medela design offers mothers the quality and reliability expected from the brand. Together, these parts cover multiple breastfeeding needs - reliable storage, tracking milk volume, easy cleaning, custom shield fits, and pump connectivity. The storage bottles give mothers secure vessels to collect breast milk during pumping or bottle feeding. The connectors help optimize pumping by enabling properly sized shields. Both components integrate seamlessly with Medela pumps for a simplified experience.