Mainstays 40 oz Stainless Steel Tumbler with Straw and Handle, Double Wall Insulated, Black

40 Ounces. Insulated, and kept my drink nice and cold for 5 plus hours outside - even though the temps went to the mid 80s', and the cup is BLACK... I was a bit surprised my drink was still cold under the blaring sun on a cloudless day! Fits into a regular vehicle cup holder - built in or add on, long so if you have a deep built-in cup or add on holder in vehicle, this will fit perfectly! The lid is a twist to shut, but I never had the need to shut it, comes with a nice thick reusable straw... I did place the cup in the freezer for a quick chill - held up fine, whatever water or tea I didn't finish, would be refrigerated, and surprisingly, still fresh!

I left my other water bottle at work and needed another. This bottle keeps the water cold even the next day. I put ice water in about 12:40 in the afternoon on Sat. On Sunday at 8:20 in the morning it's still cold even though I still had a little water left over from the day before. That means a lot to me. It tells me it works!! It's also tall.