Tupperware Vintage Tupperware Insulated Oval Server Bowls 4946A Microwaveable Hot/Cold

This set has a double-walled system to create and trap heat and can keep food warm for a good 1.5 hours. The 2 bowls can be separated to used as 2 serving bowls too. Inner bowl is 2.5 L and outer one is 3.1 L. Light, superficial marks on inside of blue bowl (shown) but the rest looks like new.