According to JD.COM's inquiry. Com, Tupperware kitchen storage box, Japanese plastic sorting leftovers separate storage box, refrigerator microwave lunch box wholesale: a single lunch box 22.5*22.5*4.5. This shows that leftovers can be replenished.

There are three kinds of fresh-keeping boxes: one is plastic fresh-keeping box, which is made of resin, and its general temperature range is: the highest temperature 120℃ and the lowest temperature -20℃. One is toughened glass crisper: ordinary glass toughened, and the last is heat-resistant glass crisper, which is made of high borosilicate glass.