This is what I do for my tool bag. I also leave a note inside with a couple more zip ties taped to it, asking whoever is going through my stuff to please zip it

This is what I do for my tool bag. I also leave a note inside with a couple more zip ties taped to it, asking whoever is going through my stuff to please zip it again. Somewhere near 80,000 miles traveled this year and it seems like a decent solution.