Years ago I had to drive around through several states for a job. I had a small truck (Chevy S10) with a cap on the back and all my tools and gear there. I kept a few empty boxes of phone and network cable with one side cut out and would slip them over top of my suitcase or any other personal gear then put the boxes that had cable in them on top.
I hang on to old clothes, use those for work around the house, be it painting or changing oil or whatever and if we ever did bug in for an extended time I'd wear those to look rough and dirty and blend in.