We discovered these cups after staying at a hotel in Miami Beach—and yes, they do keep drinks colder than plastic cups.
As the name implies, these cups are made of 100% aluminum and can be recycled many times over. (No they aren’t dishwasher safe . . . but that’s also the case for most disposable cups).
To test how much better they are at keeping drinks cold, we did a quick lab experiment.
First, we took a couple cups of water and poured them into both a red plastic cup and a Ball aluminum cup. Then we put both cups in the fridge for 30 minutes.
After that, we took them out and put them on a table at room temperature–and did an initial temperature check, which showed both liquids were about 38 to 39 degrees:
After 5 minutes, we did a temperature check. The aluminum cup was 39.9 degrees, while the red plastic cup liquid had warmed to 41.2 degrees:
What happened after 10 minutes? The aluminum cup remained colder (42.2 degrees) than the plastic cup (43.5 degrees):
Bottom line: the aluminum cup keeps liquids colder for longer—and it also felt cooler to the touch, which is nice on a hot day. Here’s more on the pros and cons of aluminum cups:
What We Liked
• 100% recyclable = more sustainable solution for disposable cups.
• Look sharp with a retro cool vibe.
• Made in the USA.
• Keep beverages colder than other types of cups.
What Needs Work
• Pricey. Yep, these cups run 5 to 10 times more than traditional plastic cups. But since these cups can be fully recycled, the eco-friendly advantage could outweigh the costs for some folks.
• Excessive sweat in humid climates. Well, that’s the downside of keeping drinks so cold.