I sometimes go to Dutch Bros. for coffee - it is the best, right up there with Caribou Coffee. I especially love the way they make an iced, dirty chai. A couple of years ago, I bought one of their insulated cups. Let me tell you, it works so well!
I filled it before going to bed and when I woke up in the morning, it still was half filled with ice. (It doesn't look half full, but this picture is not a good representation.) When I ran errands on Saturday, I left it in my car from 7:30 a.m. to about 1:00. There was still ice in the cup when I got home!
This is what they look like. They are a little spendy - I think $17 but well worth it! I know several of my friends bought them and all have been happy.