RE: Avent disposable liners
I just pulled the sides together and then clipped. It is true that you cannot have over 5-6 oz in the bag. To keep them from leaking, put them in the freezer or refrig in an upright position - I used a large plastic cup for the refrig to keep them upright and then used a large rectangle ice cube container in the freezer because it would hold many bags at once. Once they are frozen in the freezer, you can just put them anywhere. I actually used the bottom drawer in our freezer for nothing but the frozen milk. I protected it like it was gold so I did not take any chances for anything to be near it to damage it in any way. Good Luck!!!
RE: Avent disposable liners
I have folded down the top of the bag before putting the clip on them. This seems to work very well if you don't have a full bag of milk. Keeping them upright helps too!