I can never have enough block ice........which lasts much longer than bagged ice anyway. I fish, hunt, camp, travel.........and always needing block ice.
We buy a lot of various coke sizes (y'all Yankees call 'em 'sodas'....but no matter the flavor, or brand, to a Southerner, it's a 'coke').......2 Liter, and some small flavored waters, and some of the Ice brand flavored drinks in those small but tall plastic bottles.
We save 'em all. Have a 'beer fridge' out in the garage, an old side by side. And the freezer part is always full of those plastic jugs of ice, all sizes. Small ones are needed to cram down into the crevices of ice chests, when various size stuff is loaded.
I keep a one-sided razor blade and cut the top off of all these plastic bottles (BE CAREFUL--IT'S AN ACQUIRED SKILL), cut off the wrappings, and freeze water in them. It's just a ritual, a habit.....but we always have block ice. And when we get somewhere, we can throw away the plastic bottles, or keep them if they are still intact. Much cheaper than those very expensive frozen ice paks!