this post was submitted on 15 Dec 2025
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I like their idea of aluminum cups, but the boxes they come in are unfortunately made from plastic coated paperboard. (Not sure why, with their whole selling point being more environmentally friendly.)
Also aluminum is super great at conducting heat! which means your drink will rapidly move toward whatever temperature it is.
Great at conduction, but with not a lot of thermal mass, meaning that actually your drink will usually just make whatever it's touching (your hand, often) super cold or hot.
It's a two way street. Your hand is reciprocally warming the drink.
We’ve been storing and drinking beverages in aluminum cans for like a century now and this hasn’t been a big problem.
It's a big enough problem that products are sold and even given away specifically to combat the issue.
Also, the aluminum drink can was invented in 1959, and the koozie started becoming a thing in the early 70s. But I'm sure people were insulating their cans with DIY koozies before then.
Did you know you can get pint glass koozies, just like for cans?
Eg
We also have those nice paper sleeves for coffee cups that would do the job as well. At least where you touch.
So it’s an already-solved problem for this application.
Yup, I have a few, but I went ahead and bought a set of vacuum insulated steel punt glasses.
Well, plastic lined cans, though i'm not sure that affects the thermal properties significantly. And beer coozies exist for a reason.
Sure but isn't it mostly for camping equipment? Don't really see why you would use it when strength/weight isn't much of a concern.
Soft drinks and beer have been in aluminum cans for like a century at least.
Oh, you are talking about cold drinks
Yeah, for sure. Though if you drink it fast enough, it won't warm the drink noticeably before it's gone.
Ahh, here's my problem, a beer lasts me like 45 minutes or more