For several years I used an AlphaSmart, which is a keyboard with a screen and a huge amount memory. It was light enough and small enough that I could slip it into a notebook-size purse and take it with me everywhere. It was great, until it started having battery issues, and I couldn't find the cord to transfer my on-the-go writing to my home computer.
So I finally gave in. I was going to a writer's retreat and I needed something portable, with internet access. I was able to find a laptop that was reasonably light and had normal-size keys (although it was still flat). If I need to do any speed typing, I can always plug in my special keyboard. I got used to it fast. Now I wonder how I ever got along without it. How did anyone even live without computers?
Now all I need is an extension screen that will lift up to eye level so I can get rid of "laptop neck" from looking down all the time.