Once upon a time, companies such as Coleman and Igloo dominated the world of keeping things cold outdoors. In terms of volume of units sold, they probably remain the 800-pound gorillas. But Yeti, Engel and a few other brands took the game up a notch with bearproof, crushproof, bash-up-and-down-on-the-deck-proof coolers, which caused traditional cooler makers to develop similar competitive products.