Bests & Worsts Reviews from Amazon

I bought this specifically because it is not insulated. This bottle has only one wall, while some other products with similar appearance have a double wall. I wanted a bottle that I could fill with hot water, and then warm myself with it. In the past, I've used mason jars. I filled them with hot water and then held the jar in gloved hands, or put between layers of clothing I was wearing. The heat from the water warmed the bottle, and the bottle, in turn, then warmed me up. This was dangerous. A glass mason jar can crack or break leading to the glass shards cutting skin and the hot water burning skin. I now fill the 34 oz stainless steel jar with hot water for the same purpose. Stainless steel is less likely than glass to shatter. The bottle comes with a tag warning of scalding if filled with hot water. The technique I use is to make sure there is a glove or several layers of clothing between the bottle and skin. The stainless steel transfers the heat from the hot water more quickly than through glass, as one would expect. So, I use this product as my usual "hot water bottle". But I would think it could have a use also for an emergency when camping in cold weather to combat any cases of hypothermia. The way to treat hypothermia is to warm the core of the person affected. One way to do this to make a ring of fires and put the person in the middle, exposing their core to the warmth while shielding their limbs. An alternative would be to heat up water and place it in a few of these bottles, and apply the bottles to the core as described above. [Edit: I've used this bottle for several days now. I am impressed with the way it's made and it's performance. I start with boiling water, and put the bottle in between layers of clothing, and several hours later the water is still warm enough to impart heat. The hot water, as it cools, creates a vacuum as the internal pressure drops. This is good because it keeps the top even more securely on. It's not so good, though, in that the vacuum makes it a little challenging occasionally to unscrew the top when you want to open it. As I untwist the top, the silicone inner ring, which normally sits inside the top, may remain stuck due to the vacuum. The trick is to take a fingernail -- or anything else similar, like the point of a key -- and gently push the ring up. That breaks the vacuum. Another approach would be not to use the silicone ring, but the ring is there to prevent leaks, and I noticed the bottle will sometimes, but not always, leak very slightly without the ring. I would highly recommend using this bottle as a hand warmer for, say, watching an outdoor sports event in the cold. A sock can be slipped over the unit since the metal is very hot when filled with boiling water. The sock slows down the heat transmission. Over time, as the water cools, the sock could be slipped off. And when the heat is mostly dissipated, the bottle can be "recharged" by emptying it and the refilling it with hot water from a thermos.] [Edit #2: Here we are, close to a year after my first purchase, and I'm still discovering novel uses for these bottles. I'll be purchasing two more to use as... The Clothes Dryer What to do when one is camping and there is a need to dry out some thick wool socks? Maybe the socks got wet from accidentally getting water into a boot. Maybe the socks were intentionally laundered. How to dry them? The usual answer: hang them up over the wood burning stove in the tent, or near the campfire outside. Is there an alternative? Enter the steel bottle. Heat up some water on the stove or campfire, and fill the steel bottle with the hot water, ideally with boiling water. (Alternatively, put the unheated water in the bottle, and heat up the water in the bottle over the fire with th cap off.) Close the bottle. Slip a wet sock over it. Immediately steam moisture starts rising off the sock. In a short time, the sock is completely dry. This works also to "iron" dry other wet items of clothing. The versatile Triple Tree Steel bottle is the duct tape of water bottles.]