I know they’re supposed to be good for the environment. But… Holy smokes they drive me up the wall. They really do!
I had no trouble adapting when aluminum can pull-tabs got replaced by push-tabs, because it was pretty much the same movement, and I could see the immediate advantage of not getting cut by a pull-tab.
But the tethered cap is fighting decades of muscle memory in me: I’m used to taking the cap off with one hand and keeping it there while taking a swig with the other. Now I unscrew the cap with one hand, but I still have to hold the cap so it’s out of the way. It feels like drinking in handcuffs each and every time…
So unlike the pull-tab, the tethered plastic bottle cap is one of those compulsory eco solutions that constantly make you feel ever-so-slightly more miserable all the time, and I hate that because ecology only works when it brings something of value both to people and to the environment.
If you use approximately the same amount of material as in an aluminum can, you’re already at 3x the weight of an aluminum can. Stainless is also far less malleable and much more brittle than aluminum, so the minimum wall thickness is much higher for steel. Aluminum can walls are 0.11m thick, whereas the minimum wall thickness for stainless steel alloys is around 0.50mm thick. Meaning you’d need around 4.5 times as much material, making the stainless steel can weigh at least 10 times as much as the average 15 gram aluminum can. A 12-pack of soda would weigh 4.5 pounds more. Now imagine how much transporting that extra weight costs.
Stainless steel is great for reusable stuff, but it’d be impractical at the same scale as aluminum cans.