I'd forgotten that liquid expands when frozen.
The poly bottles were designed to have a little room for the expansion. My freezer packing was not. When I tried to get a bottle out today, I couldn't. They were wedged tight.
I had to resort to oven gloves (we have the sort which fit on your hands like normal gloves), and the handle of a wooden spoon.
Eventually I managed to prise one out. And then it was relatively easy to get the rest out.
