Insulate and personalise a camping cup

I love this camping cup, but I had two issues: I burned the back of my fingers when grabbing the handle if it is full of hot tea, and I had no way to personalise it as several camping friends have the same cups. I used sugru to insulate the inner part of the handle (green stripe of sugru) and also to add designs to it, so I can easily recognize it (sharpies did not stick to the surface, but sugru did the trick).