Here's an article explaining the genesis of the Stanley water bottle trend.
https://www.google.com/amp/s/amp.theguardian.com/lifeandstyle/2024/jan/12/stanley-cups-tumblers-water-bottle-trendEvidently the Hydroflask trend was more targeted to teens (I didn't know this) and the Stanley trend was more targeted to their moms, with the key feature being that it is ginormous, can fit in a car cup holder, and has a straw, which makes it easier to use while driving than a water bottle that has a twist lid.
There was a key marketing moment that Stanley realized that they could pivot from being a manly "unbreakable" camping accessory to a fashion trend for women.
The real key to understanding this is not the sustainability element, but the beauty influencer angle. The fixation on water vessels as fashion accessories comes from the age-old indoctrination of women to believe that they must drink as much as humanly possible for the sake of youthful skin and weight loss.
The Guardian article outlines how the Stanley influencer starting point was the "hydration" community on social media.
Marketing the concept that we're all fat and ugly because we don't drink enough water has been a thing for decades, and that we must learn to overcome our natural urges and shove as much water down our gullets as possible to combat puffiness and bloating is a relentless message sent to women.
As the Guardian article outlines, Fiji water was one of the first brands to really make this "hydration" fixation into a luxury fashion statement. The reusable water bottle trend is just the more sustainable version of that, although the article smartly challenges how sustainable a trend is when the marketing is designed to make women buy TONS of these stupid things in different colours.
I personally *have to* drink a lot of water. I'm on a medication that if I don't drink a lot of water every day, the meds don't work and my kidneys will be damaged. So I have an enormous 2L water bottle with me at most times.
It's pink and it at each 250ml/1C increment, it has motivational phrases encouraging me to gulp down more water. It ends with "YOU ARE GREAT!"
It's fucking ridiculous.
But for years and years women have been indoctrinated to believe that we cannot depend on our own thirst signals and must overcome them and flood our systems with water else we will look older, fatter, and uglier.
This isn't about sustainability, although that's definitely an angle of the marketing. This is about toxic beauty standards. This is about an outward display of a woman's perceived commitment to those beauty standards, which have been perversely packaged as "health."
Not to say that people drinking more water is a bad thing. Have at it folks, enjoy your water, but there's absolutely a fucked up cultural messaging behind why the fuck water bottles are a status symbol.