I've used two things in the past that have worked very well for me. I used an 11 inch sub 100 dollar chromebook for a couple of years as my mobile workhorse. Fo

I've used two things in the past that have worked very well for me. I used an 11 inch sub 100 dollar chromebook for a couple of years as my mobile workhorse. For true transportability, I've used a tablet (with a terminal emulator for some local capabilities, and with ssh for broader capabilities) and a folding bluetooth keyboard. I keep these in my bag.