Stanley has said it has sold more than 10 million Quenchers in total.Courtesy of StanleyStanley's multi-colored insulated cups still have considerable caché among teens, Piper Sandler says.At the same time, the brand's popularity may have peaked and is "on the way out," teens said in the firm's annual survey.Stanley now finds its cool factor somewhere between trend-forward Owala and mainstay Yeti.The Stanley cup craze over the past year that cost many Americans money, time, and, in some cases, their mental health and employment, may have peaked.While Stanley's multi-colored insulated cups still have considerable caché, upper-income teens told Piper Sander that the products could soon see the same fate as skinny jeans.The investment bank's annual Taking Stock With Teens survey, published earlier this week, indicated a notable trajectory in the popularity of the Stanley trend."Stanley cups placed as the #2 'Most Popular Female Fashion Trend' among the upper-income cohort — while simultaneously placing as the #2 'Fashion Trend on its Way Out' among upper-income females," analysts Peter Keith and Alexia Morgan said in a note.