In summer, whether staying at home or outdoors, we are always eager to have a cool feeling. Especially outdoors, when we are fishing, camping, and traveling by car, if there is a portable cooler beside us that can store fresh milk, food and fruit for us, or provide cold water and beverages, it is an amazing thing that makes us to better enjoy the life. At present, the coolers we produce are being sold on big e-commerce platforms, chain stores and other channels in different markets. In particular, the sales of several models are very good. Here, there are 3 best-selling coolers sold in the first half of the year 2021 to be recommended, including an air compressor model with good freezing effects as well as two thermoelectric models with both cooling and heating functions. Consumers can choose one according to their needs.