I've always loved plastic and as a medium it seems to have attracted good designers in the Sixties and Seventies.
Companies like Casdon spring to mind. They made a very classy cash register that came with a kite mark of classiness on the box. They also made a rather neat football game made of plastic, which was endorsed by Sixties legend Bobby Charlton.
But I have never associated Tupperware with well designed toys. The wheeled manned vehicles above are Tupperware.
Did you have any Tupperware toys?