(ZOJIRUSHI) Water bottle direct drinking [One-touch open] Stainless steel mug 480ml Navy SM-SF48-AD

This is a fantastic travel mug in pretty much every way. The bottle is shockingly lightweight, the locking lid is both leakproof and easy to clean, and the design is sleek and modern. However I was mostly interested in its ability to retain heat. People frequently rave about this mug online, and I've seen some wild claims about it working "too well". Apparently it retains heat so efficiently, that beverages are still boiling hot even after sitting around for days. That, to me, always sounded too good to be true. So I wanted to test it and see how well it works. I boiled water and filled the mug to the very top - the water was 208F right before I closed the lid. I put the lid in the locked position, and left the mug sitting on a kitchen counter. The room temp was 65F when I did this. After exactly 6 hours, the water was 173F, aka 35 degrees cooler than it was in the beginning. Still far too hot to drink, but a decent temperature reduction nonetheless. For comparison, the product details state that if a drink is 189F at 1 hour, it should be 160F at 6 hrs, aka 29 degrees cooler. So my water was 6 degrees cooler than advertised, but because my water started at a hotter temperature, that seems fair (also I realize that the product details won't be perfectly accurate every single time). I checked the water again after 12 hours (so 18 total hours since I started) - the temp was now 129F, and far easier to drink (but still hot). So after 18 hours, the water had cooled down 79 degrees in total. All of that being said, my takeaway is that this is a phenomenal mug. It kept my water hot for almost a day, and it definitely seems to work better than every other travel mug I've used (Yeti, Stanley, etc). However, the claims that the mug is able to keep drinks perfectly heated are clearly exaggerated. In fairness, I only did this one test, and it was by no means scientific or anything. But I think it's fair to say that while this is an above-average thermos, it isn't going to magically keep your beverages scalding hot for days. I still highly recommend it, as it works really well and it's just a well-made and cool-looking thermos overall.

About six months ago I bought a Yeti for the first time, based on all the glowing reviews. It's okay, but doesn't retain much heat after about 5 hours, and the stainless steel is either stained or rusted (and that happened after a week). So I started looking for something better. Excellent heat & cold retention was my main criteria, but ease of cleaning and no leaking were also important. And I wanted another 20 ounce cup. I studied ALL the cups with lids and their reviews, multiple times. I was trying to pay less than the bag of gold & treasure I paid for the disappointing Yeti. One day the Zojirushi popped up. I kept passing it by because it looked like a thermos, not a cup, and the price was in the same range as the Yeti -- giving the possibility of two expensive cups that didn't work. But the reviews were stellar, some of the one star reviews were because liquids were still too hot hours later, clean up did look simple, the lock feature meant no drips, and even though it wasn't a "cup", it was possible to open & drink one handed. So I put it on my list and waited for a sale. A month and an Amazon Sale Days! later, there was no sale and I bought it anyway. I'm so glad I did. It's feather lightweight, the lock feature is secure, the design of the drinking spout is perfect, it's super simple to clean thoroughly, and the heat retention is AWESOME!! I fill the container with hot coffee before I go to bed, so that I can have coffee before getting up (I'm retired). After seven or eight hours, the coffee is only slightly less hot than it was when it was packaged. Perfect drinking temperature. I cannot believe the heat retention of this thermos. If I were going to get a drink from it after only a couple of hours, I'd probably have to pour it into a cup to cool a little. Highly recommended and well worth the price. Tip: the instruction booklet is in Japanese. If you have "Google Lens" on your phone, you can take a picture of a page, then hit "translate" to switch the page to English.

I got this after watching a video comparing a bunch of other brands and this one was pretty much hands down the best performing in every category, and they're right! While I didn't really check the size, so it was kind of smaller than I expected (my bad), its lightweight, easy to clean, and most importantly it keeps the temperature extremely well. I made some tea after I got it to test this out and I came back to it around two hours later and it was so hot it scalded my tongue. It's a solid investment if you're looking for a new mug!

A reliable water bottle for keeping drinks hot and cold. The spout is easy to clean. I have one that I used for 7 years. It is very well made and last much longer than my other thermos. I am getting another one for my kid. It has a lock that prevents opening the lid accidentally.

I've used this mug for traveling and it fits perfectly in my backpack water bottle slot. It's ability to retain temperature is AMAZING - seriously it almost seems to defy physics. If you're looking for a good looking water that's high quality and can keep your coffee or tea hot for up to 24 hours, look no further!

This is a great travel mug. I can put coffee in it at the start of the trip and many hours later the coffee is still hot. Makes getting a coffee while traveling such a game changer. Love it.

I bought this mostly on a whim.... bad habit, I know. However, I have been a Contigo fan for years but never liked how the caps were hard to clean - especially when I use a powdered creamer. The 'coagulum' stayed hidden in the non-accessible recesses and was gross - think 'black snot' when it does rinse out. So enter the Zojirushi. Everything in the cap that comes into contract with liquid is accessible and can be disassembled for easy, easy cleaning. No hidden leftovers. But, does it keep coffee hot? I think so but I usually go through a container full well before it would have a chance to cool. The cap mechanism is fool proof and works well and can be manipulated with one hand. However, one very, very interesting point I noticed right away and that is that the cap does not loose or trap heat from the beverage. Other designs; e.g., Contigo seem to loose heat from the cap. Thus, heat transfer to the cap and subsequent cooling of the beverage happens. Two negatives: 1. it does not fit under my Keurig brewer. This means you'll need to transfer your drink to the Zojirushi - that is inconvenient but I'm willing to put up with that. 2. The Zojirushi skinny. I have not tried it in my Mazda's cup holders. It will fit of course but how tightly remains to be seen. I like the Zojirushi but wish it was fatter and shorter. Five stars because of cleaning easily, operability and heat retention.

Overall this is a nice water bottle. The slim profile ensures it fits in virtually any holder on a backpack. It retains temperature well, keeping water cool for a pretty extended time period. One thing that stops this from being better is the drinking spout and lid. The way the spout is angled, unless you tilt your held back as you drink, your nose will hit the stopper of the lid. Other bottles I have has a more generic drinking spout shape so I can drink with the lid off to the side if I wanted. It's more difficult with this bottle. 4 stars. 1 star deducted because of the spout and lid positioning. There are better water bottles out there. Really deserves 3.5 stars but there's no option for that.