The Truth About TikTok's 'Life-Changing' Tumbler

What's $23, available in 33 colors, and has five stars and more than 40,000 reviews on Amazon? It's called the Simple Modern Classic Insulated Tumbler, Amazon's number-one selling on-the-go drinking glass that's been written about by many news outlets for its popularity on TikTok. If you're on the app, you may remember Christina Najjar, better known as @tinx, saying that the "adult sippy cup" has changed her life.

The tumbler comes in both solid colors and bold patterns and is available in four sizes ranging from 16 to 28 ounces. It comes with two lids: One with a straw for cold beverages like water and seltzer, and another with a flip lid for hot coffee and tea, according to the product description. The cup should be hand washed, but the lids can be thrown into the dishwasher. Finally, its size is compatible with most cars' cup holders, the lids are "spill proof," and the whole thing is made of stainless steel, so it's ready to be taken along on even the rowdiest adventures.

The tumbler is most loved for its temperature-keeping powers

The real selling point of the Simple Modern Classic Insulated Tumbler, says @tinx, is its ability to keep water ice cold. "The way that they were talking about this cup, you would think it has magical powers," the TikTok user said about the Victoria's Secret models that convinced her to buy the tumbler. Now she's a full convert, carrying her own around "like a baby" and singing its praises for making water taste even better.

How does it work? The tumblers are "double walled and vacuum insulated, which keeps your favorite beverage hot or cold for hours," says the product description. Real Simple specifies, adding that cold drinks will stay cold for 18 hours, while hot ones stay warm for up to four. It may even make you want to drink more water, the author says. And a last possible bonus of the TikTok-famous tumbler? "If models say it's good, maybe it'll make me beautiful," @tinx speculates.