Collapsible 20L "no chill" container recommendation?

[deeve007]

Hey guys,

So going the no-chill method, have done a couple of batches this way but just "no chilling" in my fermenter, which has been fine so far but obviously risking it with the amount of headspace leaft... so wondering if anyone has a collapsible 20L/5 gallon cube they would recommend? US fine as have a friend coming that can bring it with them.

 

[deeve007]

And is "BPA-free" what I'm looking for in a container, if searching on Amazon?