I had read that the Thermos Nissan insulated bottle was one of the best, if not THE best. I decided to 'give it a go', so I ordered the 61 ounce container. I tested it for heat retention only. Normally, on my Stanley insulated bottle, I would pre-heat the container by filling it with boiling water, sealing it and leaving it for approximately 30 minutes. I'd then empty it and then immediately fill it with my hot coffee. I prefer my coffee to be hotter than the average person likes it. Even tho' Stanley had been considered a 'benchmark' in insultated containers, I was never even slightly impressed with Stanley's ability to keep things hot.
With the Thermos Nissan container, I did NOT pre-heat the container with boiling water. What I DID do was fill to it the top with microwaved boiling water. I capped it, left it in an 80 degree environment, then waited. After 6 hours, I poured out approximately 16 ounces of hot water. The temperature might have dropped 10 degrees, still leaving the liquid far too hot to consider drinking. Great! After 6 more hours, I poured out another 16 ounces. The water scalded my lip as I tried to sip a few molecules. Hot dog! I have a REAL insulating container here, people! After waiting 6 more hours, I poured out another 16 ounces. The temperature was dropping, but I still had to blow on it before sipping. After 5 more hours, for a total of 23 hours, I poured out the remaining water. The water was now close to my normal drinking temperature, still too hot for most people. Bear in mind that I started out with boiling water, but still...
It's needless to say that I am thrilled with my Thermos Nissan! What is truly amazing is that as you open and pour out a portion of the hot liquid, it's easier for the remaining hot liquid to lose heat. With the Thermos Nissan, the overall heat retention was outstanding times 10! Retaining heat, with the container being mostly empty was incredible and Thermos Nissan surpassed any and every expectation I could have ever had. If you are in the market for an insulated beverage container, THIS is it! Try as you may, you won't find a better one.