Milk storage question, help!

Nicole

So I have some Snappies that was given to me from the lactation consultant. I was wondering if it was ok to freeze my milk in them and if they work well? I assume you can. Also are they reusable? There is an expiration date on the bag, but they come sterile. I assume the date is for how long it stays sterile. It says they can be washed so I'm guessing I can reuse them? Thanks!