In 1981, Tough Boy, a thermos flask with a vacuum layer only 1.1 mm thick, was 2.4 mm thinner than the mainstream products at the time, and the content of the product with the same volume became larger, promoting the development of the entire industry.
 
Compared with the thermos who focuses on thermal insulation products, Zojirushi has developed comprehensively in the field of kitchen supplies, and IH rice cookers and electric kettles have the largest market share in Japan. Subdivided into insulated lunch boxes, the products provided by Zojirushi are basically the same as those of thermos, and there are three main series: SL is a multi-layer insulated lunch box, SW is a stewed can, and SZ is an insulated lunch box. The SZ series products are also not available in China and need to be purchased overseas. However, the design of the stewing jar is slightly insufficient, and it needs to carry additional tableware, which is not as convenient as the thermos when going out.
 
Compared with the stewed jar, Zojirushi's multi-layer insulated barrel has more advantages, with a pure black barrel body and a simple shape, which is more beautiful than similar products of thermos and tiger. The SL series has a minimum overall volume of 600 mL and a maximum volume of 2 liters, so you can find the right volume for children and adult men with large appetites. The side of the insulated bucket is designed with a chopstick box card slot, with a portable bag or straps, which is easy to use, and the e-commerce price is about 360 yuan. In addition, the inner wall of the insulated barrel also has Zojirushi's signature fluorine coating, which is easier to clean than the stainless steel inner wall and will not leave food odors.
 
SW series stewed jars are equipped with anti-scald rings, the upper lid of the middle bolt, the sealing ring can be disassembled and cleaned, but there are many parts, the installation is slightly troublesome, and unlike the stewed jar of thermos, there is a spoon to place the card position, the user needs to carry tableware, because of the different capacity, the price fluctuates between 250-350 yuan, and the thermos is the same level, portability and cost performance are slightly discounted.