We drink cranberry juice. To fill in the empty spaces and build up the bottom of our chest freezer, I freeze water in the 64 ounce cranberry juice containers. They lay flat and fit perfectly between the dividers. This helps to keep the freezer full.
When the summer garden starts coming in, I remove the ice containers as needed. When defrosting the freezer, they are not as heavy and hard to handle as the gallon milk jugs I was using.
These containers of ice also work well in the cooler when we are traveling.