I bought two of these to freeze expressed breast milk in sticks which can be defrosted in the bottle. They're the only product I could find available to buy in the UK to do this, as most other trays are cube-shaped, so these do what I need them to. However, it would be better if they had a lid, as I often end up spilling milk while putting them in the freezer. Also, I would have liked to be able to choose the colour. But they are easy to clean and didn't cost too much.