I was skeptical of yet another water bottle, even a stainless steel one, but this bottle exceeded my admittedly high expectations. I drink a lot of water throughout the day, so the 40oz size fits me well (usually drink 2-3 a day). I use it for both coffee and ice water. I couldn't believe it when I mistakenly left this bad boy on my dashboard during the middle of the summer for most of the day. When I came out to get it the outside was nearly too hot to touch, but there was still ice inside! Amazing product. Want a growler...