There are two things that people never leave behind at a potluck: their kids and their Tupperware. Seriously, have you ever seen anyone repark the car to fetch the lid to the "Tall Entree" GladWare container they brought to the party?

Tupperware (NYSE: TUP) is more than just some plastic container to keep leftovers fresh for the next couple of days. It's such an icon of its product category that -- like Kleenex, Xerox, and Band-Aid -- "Tupperware" has become a synonym for any old food storage container.

Like Avon (NYSE: AVP), Tupperware distributes its wares via the old-school direct-seller model. But unlike Avon -- which we panned on a recent episode of Stock Picks With Chicks -- Tupperware has stayed fresh no matter what the economy's temperature.