Thermoflask Double Stainless Steel Insulated Water Bottle, 40 oz, Cobalt

It works great. I went with the 40z to avoid having to refill often. 4 large ice cubes keeps the water cold for about 6-8 hours. Ice cubes left in it empty overnight are still frozen by morning. It's not the most extreme insulation on the market but it's a good compromise with being thinner/lighter which makes it perfect for daily use, filled once or twice throughout the day. A real upside to this design is the 2 tops it comes with. Both are high quality and clever design, unlike many cheaper canteens for sale. The straw spout is fully capped with a softer material that's nice to drink from. But most useful is the handle design. You can comfortably drink and carry from the narrower cap, even when it's completely full, without having to ever touch the wider body. So you've got great control over the bottle no matter what you're doing. It also gives you leverage to open and tighten and the cap so there's never any leaks. This is perfect for people with smaller hands, though the keyhole shaped handle will fit any size hands. It's VERY clever and much more functional than the pivoting strap design on most other canteens. The caps were the big reason I chose this over others and it really does make a difference when I use it every day. It's the main reason I want to leave a review, since some designer made a pretty noticeable improvement with that clever trick. For someone else that complained about the noise, the straw has a pretty high flow rate which is usually nice. To avoid any noise you just have to drink more slowly, like you're sipping through a regular straw. But the second included cap is general purpose, and has a latch mark on the swing-back cap so it won't flop forward while you're drinking or pouring.

I take this when I travel overseas. Its lightweight and easy to pack in a carryon. It keeps liquids cold an entire day and does not leak. It also looks very stylish too. Very pleased with this purchase.

Great for school day. Every great item. It comes with spare straws and another lids for replacement.

Product is good but costly

I am on a diet & exercise program that pushes drinking 48-64 ounces of water a day. The coach recommended using a hydration flask and carrying it around everywhere I go. I see people do that and groan a little, but hey, if it works, it works. So, on to which flask to get. I have a Takeya--a gift from a dear friend. 32 ounces. Very heavy when filled, and a bit cumbersome to lug around. I also have a Bubba flash from WalMart--48 ounces--even worse. Great flasks, mind you, just too big. I immediately considered another Takeya. The 32 ounce flask I have is great. During my research, I came across HydroFlask. Wow, super expensive. Apparently they are the flask of choice for teenage high school girls. "VSCO girls", I believe they are called. Sorry, I'm not going to pay a premium price for a product just because the company can take advantage of a bunch of trendy teenagers. Then I came across ThermoFlask. It seemed no different from Takeya or HydroFlask. The flask I selected was about $4 cheaper than the Takeya, and it came with two lids--one for "chugging" and one with a built-in straw. ThermoFlask it is. A couple of days into it, and I like the ThermoFlask. Performance is every bit as good as my Takeya. The design of the "chugging" lid is slightly different and, in my opinion, slightly better. The design ensures the cap is completely out of the way when you drink from the bottle. Very nice. The straw lid has a sort of silicone bit on the end, which does make use of the flask a more comfortable experience. I find that silicone lid needs frequent scrubbing as it attracts dirt and other nastiness. I wash it every day--that seems to do the trick. Ice water lasts about as long in my ThermoFlask as it does in my Takeya. Believe it or not, my 48 ounce Bubba from WalMart blows both of the other two away. Go figure. The finish on the ThermoFlask appears to be the same quality as the Takeya. The finish on the Bubba is painted, not powder coated. The Bubba also has a rubber foot on the bottom, so it won't damage any surfaces. Neither the Takeya nor the ThermoFlask have that, which is unfortunate. I think if there were a 24 ounce Bubba available, I might have gone that route. The lid design on the Bubba is exceptional, as is the rubber foot and the performance with cold liquids. Since they don't (as far as I can tell), the ThermoFlask and Takeya are perfectly acceptable. The two lids for the ThermoFlask make it a good choice over the Takeya. The Takeya is three years old and going strong. Hopefully I'll be able to say that about the ThermoFlask in three years.