A：Cooling power 1，Using 3cm of extra-thick insulation (main), the cooling power is comparable to that of a hard cooler. 2、Using both the outer and inner coolers, a maximum of 8 cm of insulation can be achieved (main: 3+3, sub: 1+1); 3，If you DIY the main insulator, the cooling power will be further improved. 4，With the help of extra-thick insulation, the outer wall and the bottom will be free from condensation. 5，Power Up Sheet (sunlight reflective cover) included, OK even in the hot sun, safe even in the rain. 6、There are three spaces at the same time: a normal temperature zone, a cold storage zone, and a Cold Storage Plus zone. Can be stored separately according to your needs. B：About space 1，Consists of an outer cooler and an inner cooler, which can be used separately. 2，Almost all soft coolers (including hard coolers) of extra-thick type cannot be folded, but this product can be folded. 3，Main insulator can be removed for more space. 4，Outside cooler can be extended to increase capacity up to 10 liters. 5、The cooler body and the main insulator can be stored separately, allowing the use of space in the car. C：Ruggedness 1，YKK zipper is adopted. 2、Main insulation material is very sturdy and dense, so you can sit on it. D：Convenience 1，Thermometer is equipped as standard, so you can check the melting status of ice inside without opening the container. 2，Power Up Sheet can be used as a storage bag for removed heat insulators. 3，Inner is completely waterproof and can be removed for washing. 4，When more space is needed than cooling power, the main insulator can be removed and only the sub insulator can be used. 5，It can be used as a tool box without the main insulator. It can be used as a tool box without the main insulator. 6，Fishing rods and small outdoor items (small lanterns, knives, etc.) can be hung.