This set of Colostrum Containers with Lids includes four 45 mL collection bottles designed for use with Maymom MyFit breast shield base connectors and compatible with Ameda and Medela® one or two piece breast shields. The bottles feature easy-to-read measurement markings with precise 0.5 mL increments, making it simple to track even small amounts of colostrum or breast milk. Unlike printed markings that can wear off over time, the measurements are permanently embedded into the bottle for lasting visibility and accuracy. Made from heavy-duty, food-contact-grade polypropylene (PP), these bottles are BPA-free, durable, and designed for safe daily use.