What kind of cooler do I need if I want ice to last five days?

Get a rotomolded cooler from Yeti, Pelican, Orca, Engel, or RTIC. They all use thick polyurethane foam injected into a rotomolded plastic shell with a rubber gasket, which keeps ice for five days in 90-degree heat. Cheap coolers with thin walls and compression latches leak cold and won’t last as long.