The main difference between the two styles of Canteens™ is the temperature at which they heat the Smoke Juice. The warm Canteens™ are 1.8 ohms and will heat the Smoke Juice at a warmer temperature. The cool Canteens™ are 2.4 ohms and will heat at a cooler temperature. The warm Canteens™ are clear and the cool Canteens™ are a translucent red. The warm Canteens™ will produce just a little more vapor as more Smoke Juice is being heated and more energy is being used from the battery. The cool Canteens™ will be a slight energy saver as less Smoke Juice is being heated and less power from the battery is being used.