She started coveting it after seeing social media posts by Kristin Johns and Emilie Kiser, each influencers who submit about motherhood. However each time Stanley restocks the tumbler, it has offered out, she mentioned.

Launched each few months in batches that fluctuate in amount, the tumbler has been listed for as a lot as $100 on the resale web site Poshmark. About 110,000 individuals have signed as much as be notified by Stanley when it’s again in inventory, mentioned Terence Reilly, the worldwide president of Stanley, who added that the product’s gross sales elevated by 275 p.c in 2021 in contrast with 2020.

However just a little greater than two years in the past, in late 2019, Stanley stopped restocking the Quencher on its web site. Although nonetheless out there for buy elsewhere, “it was not being prioritized from a manufacturing and advertising and marketing standpoint” by the model, Mr. Reilly mentioned.

Its return to Stanley’s web site in early 2020 is basically owed to a few ladies: Ashlee LeSueur, 42, who lives in Carlsbad, Calif.; Taylor Cannon, 34, who lives in Buy, N.Y.; and Linley Hutchinson, 36, who lives in Alpine, Utah.

Ms. LeSueur and Ms. Cannon, who’re sisters, and Ms. Hutchinson, their cousin, run The Buy Guide, an e-commerce weblog and Instagram account, the place the Quencher tumbler was among the many first merchandise they featured, in November 2017.

“Each time we linked it, it might promote out so rapidly,” Ms. LeSueur mentioned. “We obtained so many footage from academics who all have them of their school rooms and from nurses stations with cups overflowing in several colours, and we knew we have been onto one thing.”