Recommended series: 6-piece set of freezer fresh-keeping box, MM storage and fresh-keeping series
 
Tupperware's founder, Il Teberware, was the first to discover the plastic polypropylene (PP) and used it to make plastic containers with food preservation functions, which has been called one of the greatest inventions of the 20th century by Guinness World Records. By the '90s, 90 percent of U.S. households owned at least one Tupperware product.
 
Tupperware's crisper boxes all use push-to-press lids, and the belching sound of exhaust when pressing along the edge until the lid is closed is a symbol of its brand identity and fresh-keeping sealing ability, which has continued since the product was first established.
 
Tupperware's refrigerator crispers for the Chinese market are made of polypropylene PP and are available in two designs: refrigerated and frozen. The heat-resistant temperature of polypropylene PP is -20 °C to 120 °C, but the plastic is easily brittle and shortens the service life when placed in the freezer layer of the refrigerator for a long time.
 
The lid of the Tupperware crisper box is made of PE material that is softer than PP, and it will not become brittle after multiple freezing and thawing, and it is more durable.
 
Tupperware online sales are mainly sets, although they are plastic fresh-keeping boxes, but the price is not lower than other brands of glass fresh-keeping boxes, and the 8-piece refrigerator sets sold in e-commerce include four frozen and refrigerated fresh-keeping boxes, and the proportional design can be stacked and placed relatively neatly, but the price of more than 300 yuan is still not affordable. Compared with the 8-piece set of two fresh-keeping boxes, we recommend buying a 6-piece set of freezer fresh-keeping boxes, which is more reasonable in capacity and size, and the price is about 260 yuan.
 
The maximum capacity of MM storage and preservation series is 8.7L, which is more suitable for receiving dry ingredients such as nano bean noodles, but the e-commerce only has two 8.7L combinations, and if you need other sizes of products, it is recommended to buy them offline.