I put my bag in the back today, drove about 15 or 20 minutes, and when I got where I was going I took out the bag and felt it. It didn't feel hot to me. The laptop is towards the top of the rolling bag, but the problem is that the bag is so big I can't put it in my front seat and I think it would be a lot more difficult to get it in the front trunk.
This is a picture of my bag. That zipper towards the top is where the laptop goes. I've got my court reporting machine underneath though, which costs more than a laptop.
