Don’t ditch your vintage kitchen gear just yet.

You probably know the old adage “what’s old is new again,” but did you know there’s actually a market for vintage tupperware on sites like Etsy and eBay? Turns out, some pieces can retail for quite a bit of money (though you probably won’t make as much off them as you would selling your vintage Pyrex.)

Select sets from Tupperware’s Wonderlier line or Servalier line could retail for hundreds of dollars. Other vintage Tupperware pieces typically sell online for $2 to $20 each, but could be more, depending on the condition and age of the items.

Stacy Verdick Case sells vintage Tupperware in her store, Peony Lane Designs, and on Etsy. Case told TODAY she recommends checking out garage sales and estate sales for vintage pieces. According to Case, those most popular Tupperware comes in the “Crystal” color, since the company still makes replacement lids in that shade. The midcentury “Millionaire” line of pinks, greens, and blues are still highly sought after, too.

Whether you inherited your storage containers from your mom, or found a set at the thrift store, there’s something inherently cool about using vintage Tupperware. By buying vintage, you’re practicing sustainability and reusing something from a different generation. Plus, Tupperware is one of those kitchen workhorses that still functions perfectly after decades of use.

If you’re interested in scooping up some vintage Tupperware, but aren’t sure if it’s legit, there’s an easy way to tell. Case said, “To authenticate any piece of Tupperware, look for a two-part number (its mold number) stamped somewhere on the product and make sure the word "Tupperware" is also visible.”