What the others said. But with freezing - buy some special breast milk bags from Boots (I found the Avent ones split all the time but the Lansinoh ones were great) and write with a freezer pen when you expressed and how much is in the bag. Makes it much easier when you come to defrosting. And don't overfill the bags - much better to have several 2oz bags than one 8oz bag as you can just defrost what you need.