These are very useful it you want to build up a supply in the freezer,whether its for the odd day out or because you are returning back to work.

There are small bags with measurement on the outside so you can tell how much is in there,a plastic fastener,one for each bag,for non leakage and a plastic fastener to expel the air out of the bag.There is a place you can write the date and time.

Just tip the milk in,expel the air and fasten it up,then put it in the freezer.The dating idea is good so you can rotate you stock,and breastmilk can be frozen upto 6mth in deep freeze.If you want to add to the bag just undo the bag and pour more in but it needs to be frozen within 24hrs.

I used these for storing expresed milk,or if using the breast sheilds,the milk that they catch.They are quite expensive £7.99 for 40 bags with ties, but I think they are invaluable especially if you are planning to go back to work you can give your baby expressed milk while you are not there.