"JoeSpareBedroom" > wrote in message
> zzzzzzzzz.........
>
> Leave some headroom (space) at the top of the jar when filling, and leave
> the lids loose until the contents are frozen. Same as you would if using
> glass. Do you need the clouds to part and the friggin' voice of god to
> explain this? You just got exactly that.

Does not necessarily solve the problem. Too much headspace = too much air.
Some plastics will still bulge. Some plastics are not made for freezing and
do not perform as well and can crack.
Do you need the clouds to part and the friggin' voice of god to explain
this? You just got exactly that.