Purely paper-less is a hassle. I tried it and I never managed to get rid of it all for various reasons.
While I keep all my lists in OmniFocus, I still love to write and scribble on paper. I also keep part of my journaling on paper.
Can you setup your physical filing cabinet at home and then only bring the files you will need in folders?
Another idea I have played with is using an archive box as my filing cabinet. I put empty and used folders in there and if I need it elsewhere, I put the lit on and carry it over. This is also the one I still use for remaining paper files in my life.