Storing a stash of breastmilk can eat up a lot of space in your fridge. You can maximize the space with these Korean-made milk bags. Unlike storing liquid gold in baby bottles, you can neatly organize and stack these bags together. Each has a temperature detection feature so you can easily tell if it’s safe to give your pumped milk to your little one right after thawing. They're leak-proof, too! Each bag has a double-layer ziplock. When you're ready to use a bag, simply defrost the milk, cut the spout, and pour into the bottle.