Recommended series: Grasse fresh-keeping box, plastic fresh-keeping box HPL series
 
The four-sided ring lid used in the common crisper on the market was first launched by Lock & Lock, which is not only the logo of Lock & Lock, but also the guarantee of the tightness of the crisper. Since its launch, the Lock & Lock Four-Sided Lock Crisper has long held the first place in South Korea, and has won design awards such as Red Dot and iF, and has also won the best evaluation of "seht gut" in the most authoritative Öko test in Germany.
 
According to the material, Lock & Lock is divided into two categories: Grasse and plastic crisper boxes. The Grasse crisper is made of borosilicate glass, which is heat-resistant and can be used in microwave ovens and ovens, and its lid is made of PP plastic, which can be covered when microwaved to avoid excessive evaporation of water in food, but the corner of the lid needs to be lifted when used. The price of Grasse fresh-keeping box is relatively high, and the unit price of 300mL small capacity is more than 30 yuan. If you often use microwave heating, it is recommended to choose a modern breathable series of fresh-keeping boxes with ventilation openings on the lid, this series of fresh-keeping boxes has a higher lid and can hold more food, but the upper surface of the lid is uneven, and the fresh-keeping boxes of the same size cannot be stacked.
 
There are two series of Lock and Lock plastic fresh-keeping boxes, HPL series is made of polypropylene (PP), the price is much cheaper than Glass, and the price of 500mL is not more than 20 yuan. Although plastic crisper boxes are more affordable, polypropylene materials are easy to age, and when the plastic part of the box becomes dull and dull, it means that you need to replace it with a new crisper box, which does not last as long as a glass crisper box. In addition, although the temperature resistance of polypropylene ranges from -20°C to 120°C, polypropylene is prone to brittleness when the ambient temperature is below 0°C, so putting a plastic crisper in the freezer will affect its lifespan.
 
The Bisfree series fresh-keeping box is made of Tritan, which has a light transmittance comparable to glass, is more translucent than the general PP crisper, and the material is lightweight, but the heat resistance of this material is about 100 °C, which is only suitable for fresh-keeping and storage containers, and is not recommended for microwave heating. The plastic fresh-keeping boxes of Lock-Lock are mostly sold in the form of combinations, and the price of 5-piece fresh-keeping boxes with a capacity of less than 1L is 68 yuan, but consumers need to pay attention to the capacity and size of the product when purchasing to avoid buying products that do not match the size.
 
Compared to the HPL and Bisfree series with four-sided ring lids, the INL and LLS series of round crispers with screw-on lids are more suitable for cabinet storage, such as storing beans, dried vegetables and nuts. In order to facilitate stacking, the INL series has the same diameter of each capacity, there is a buckle lock design on the lid, the upper and lower jars can be rotated and locked to prevent falling, the translucent plastic is matched with a pure white box cover, the appearance is neat, the price of the 500mL two-piece set is 32 yuan, but it needs to be taken off when taking it off, which is not convenient enough, and the material of the box body of this series is PET, which is very heat-resistant, and pouring hot water may lead to deformation, the LLS series of PP material is more durable, and 1.9L is only about 30 yuan, which is more affordable.