Nursing mothers who saw Milkies Freeze were instantly drawn to it. They told us stories about their freezer’s which they described as complete disasters with bags of frozen breast milk everywhere and the frozen bags were in all shapes and sizes. After using Milkies Freeze they delightedly reported that they had completely changed the way they freeze and store their milk. No more searching for the oldest bag. The freeze tray at the top helps to freeze the milk flat. Once frozen, the slit at the top is wide enough to slide the bag in. The slit at the bottom is also wide enough to pull the oldest bag out. This is the best product any of our testers had seen to store breast milk using a first in first out basis.