First measure your freezer space to see what is the maximum length your tubes can be and see what your maximum cooler length is so you can custom fit your Polar Bear tubes. Make Polar Bear tubes from 2 inch PVC pipe available at your local hardware store. Includes a 20 foot 2 inch PVC pipe end fittings and PVC glue. When assembling, fill with water but not full (90%) as you will need a buffer space for expansion so you wont bust the Polar Bear tube when freezing. Keep everything clean in case you need these Polar Bear tubes as an emergency water supply. Glue end cap on one end of Polar Bear tubes and let it setup for a hour. Fill with water to 90% and glue on other end cap. Keep it vertical so that cap can set with out being in the water.
I made 6 Polar Bear tubes for my big cooler that are 21 inches each. Make as many Polar Bear tubes you like.
Polar Bear tubes. These are 21 inches as that the maximum length that my garage side by side refrigerator/freezer will take. Hopefully yours may match your cooler length.
Ok lets go catch some fish.