Unfortunately, the twist-off lid required the use of both hands, which kept the Fellow Carter from taking a top spot. When we first tested the Fellow Carter mug, we tried the Move model-a gorgeous ceramic-lined thermal mug that does a great job of keeping hot drinks hot. It’s also a little too easy to accidentally remove the entire lid when trying to open the spout. After a few tries, it’s pretty easy to get used to how it all goes together, but coming from a brand that makes such user-friendly products, this leak-proof lid is more complicated than it needs to be. Disassembling the lid for cleaning and reassembling it are each three-step processes-and the steps are so unintuitive that instructions, arrows, and numbers are actually embossed in various spots all over the three separate lid components (four if you count the removable gasket). However, the engineering required to get such a good seal is… a lot. The mug comes in an array of pretty colors, all of the parts are dishwasher safe, and we found the lid to be truly leak free when properly assembled. In 2023, we tested a newer model, which has what the brand calls a leak-proof “Simpl圜lean” lid. We’re generally big fans of Oxo gear but the Oxo Good Grips travel mug we previously tested always leaked a little when tipped upside down. Oxo Good Grips Travel Coffee Mug With Leakproof Simpl圜lean Lid Finally, sipping from the Zojirushi is slightly more awkward to drink from than many of the other mugs we tried, but it’s a small price to pay for such incredible heat retention and the peace of mind that comes with having a truly leak-free travel mug to use for hot drinks on the go. The super-slim design also means this mug may rattle around in a car cup holder, and the 20-ounce size is too tall to fit under our Nespresso VertuoPlus spout (you’d likely run into the same issue with other single-serve coffee makers). We weren’t able to find any kind of documentation on what that coating actually is but it probably is nothing to worry about as the issues with nonstick cookware are around exposing it to direct, high heat or scratching it with metal utensils, neither of which are likely in a coffee cup. That kind of cleaning shouldn’t be necessary often since the inside has a non-stick coating. This was the slimmest travel mug we tested (the opening of all three sizes is just 1⅝ inch) so if you want to clean it with friction, you’ll need a soft bottle bottle brush. M.The Zojirushi travel tumbler isn’t dishwasher-safe, which is true of many vacuum-insulated vessels. 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 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.
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