Many mums want to have extra breast milk bottles on hand to meet their ever changing breast milk supply. Medelas bottles are a great solution as they are compatible with all Medela breast pumps and teat-like Calma devices. Helping to make it easy to pump, store and feed breast milk all using the same container. This means not a single drop of your precious breast milk is wasted and you have less washing up to do! Medela bottles have been designed for the safe, long-term storage of breast milk. You can pump breast milk directly into the baby bottles and store it. You can also feed your baby using the same bottle. The bottles are made from a safe plastic designed to retain the breast milk's beneficial properties and are ideal for the safe storage of breast milk in the refrigerator or freezer. The colourful ounce and millimetre markers make it easy to measure the exact amount of milk you have expressed. The bottles also feature screw-on lids so that they do not leak when they are stored in the fridge or freezer, or transported when you are travelling.