[kawishiwi]

Why buy ice? I have a few Costco mixed nuts plastic jars, wide round top on sqaurish container. Maybe 5" x 6" x 7". Filled 80% with water and then frozen they nestle into the bottom of a cooler nicely. Throw in one or 2 doses of cubes from the fridge ice maker & I get a solid weekend of cool in moderately cheap coolers.
Packing ice for 7 day island camping? YETI or similar might be worth it. Maybe. Even then, dry ice used to be a commonly available thing in the upper midwest. Lotsa loads of walleyes brought back in ragged coolers back then...