I recently bought the Megaslim 2-in-1 vacuum bottle shown on bicyclecoffeesystems.com site from Campmor. Not bad. I use the sealed/pourer top, and have not used the waterbottle style top yet. I use it for coffee, commuting 45 mins to school. For some reason, the first time I used it, the seal wasn't perfect, and it leaked a few drops into the "cup" top. However, I have since removed and reinstalled the silicone seal, and have had no more leaks at all since then. I measured about a 5 degree F drop in beverage temp per hour using it in this configuration--more than adequate for my purposes, since I drink the coffee w/in 4 hours from being made. I happen to have about 10 of the plastic Profile Kages mentioned on the above site around, as they used to sponsor me, and the Megaslim fits in there fine, a slight bit loose. It could eject in very severe conditions, I suppose-- a crash, or jackhammer washboard at speed. However, I have not tried a smaller rubber band in the Kage's top channel, and I do think that might remedy such risk. Two things on the item's finish: it feels quite cheap compared to more expensive bottles, and it dings rather easily. Mine already has two little dimples from just falling over in the parking lot. If you are gonna really throw it around, I'd advise getting a vacuum bottle that is NOT stainless steel on the outside, but the plastic/polycarb instead. Or maybe Nissan uses heavier ss--for twice as much $, they should, eh?

I am satisfied with it. BTW, I did leak-test the water bottle top, and it did not leak under non-vigorous conditions. Also, it's got a vent valve so you get a smooth flow--I don't know that I'd want to suck hot coffee out of it, though (it's got a warning saying "no hot beverages" or the like).