SIXTYFOUR OZ COFFEE MUG FREE

Over time, they can wear out, and many harbor foul odors. All except the Yeti Rambler and Bubba Classic required using a bottle brush.Įach mug in our test had at least one silicone gasket, and some had as many as three. Then we cleaned each one as directed, assigning points to those that were easy to clean and subtracting from those that had hard-to-clean nooks or gaskets in their lids that retained soils even after a thorough scrubbing. We drained and opened the mugs, and then let them dry overnight. To rate how easy mugs are to clean, we filled each mug with a mixture of hot coffee and creamer, and sloshed the contents to saturate the inside of the lid.

“We found that mugs that were well-insulated did a great job with keeping liquids either hot or cold,” Deitrick says.įor our leakproof test, we filled each with water and shook each mug from multiple angles, noting whether any liquid escaped. We also tested each mug to see whether it could keep cold drinks cold as well as hot drinks hot. Then our testers opened each mug at set intervals to take the temperature of the water inside until it dropped to 140° F-better known as lukewarm. We also grade mugs on convenience, including whether they fit in cup holders in a variety of cars and whether you can open the sipping mechanism with just one hand, which is crucial when you’re driving.įor the temperature retention test, we filled each mug with boiling water (212° F) and immediately screwed or pressed each lid back on. M.We test how well insulated travel mugs keep drinks hot or cold, whether they resist spilling and leaking, and how easy they are to clean. Jenna Bilbrey, BPA-Free Plastic Containers May Be Just as Hazardous, Scientific American, August 11, 2014 Bolden, Bisphenol S and F: A Systematic Review and Comparison of the Hormonal Activity of Bisphenol A Substitutes, Environmental Health Perspectives, July 1, 2015 Jon Hamilton, Beyond BPA: Court Battle Reveals A Shift In Debate Over Plastic Safety, NPR, February 16, 2015 No consumer health risk from bisphenol A exposure, European Food Safety Authority, January 21, 2015 PH Gleick, HS Cooley, Energy implications of bottled water (PDF), Environmental Research Letters, February 19, 2009īottling Our Cities' Tap Water (PDF), Food & Water Watch, August 1, 2010

SIXTYFOUR OZ COFFEE MUG FREE

Jocelyn Ivanov, MIT, Drinking fountains: the past and future of free public water in the United States, September 29, 2015 Wesley Johnson, cryogenics research engineer at NASA’s Glenn Research Center in Cleveland, email interview, August 22, 2018 So, “the copper liner needs to be: polished, installed in a vacuum, and done so in a manner that limits the amount of oxidation of the metal prior to pulling the vacuum.”

“The main benefit of copper is that when it is polished, it is much more reflective of radiation heat transfer,” Johnson explained. But it works only under a set of specific circumstances.

And copper can work to stop that last method of heat loss. “This leaves only radiation heat transfer between the walls,” Johnson said. A double-walled bottle already stops solid conduction, and a vacuum-insulated bottle stops gaseous convection. It could work, and as Wesley Johnson, a cryogenics research engineer at NASA’s Glenn Research Center in Cleveland, explained, “For spacecraft, we often use a similar technique for insulation.” The theory behind using copper in insulation (despite its being an excellent conductor normally) is based on the fact that heat transfers through three forms: solid conduction, gaseous convection, and radiation, Johnson told us.

Sometimes manufacturers make bottles with copper linings in an attempt to keep the contents even hotter or colder.

Sixtyfour oz coffee mug