All of the major brands sell well made coolers to keep things cold. Those new trendy brand like Yeti are pricey but not necessarily better. Look for a cooler that is well made, has good insulation around the side/bottom and a tightly fitting lid. If you can get dry ice from a local grocery store, that keeps things cold the longest and doesn't melt into water like ice tends to do making a mess in the bottom of the cooler. There are also various products you freeze and can put in the cooler, but once it turns back to a liquid, you need a freezer to make it cold again. Also depends on how far you are traveling, how often you plan to use it and if you are trying to keep food safely chilled compared to things like beverages.