Uncle has links to what others take in their range bags.
I must admit, I pack pretty darn light usually: Guns, ammo, hearing protection, targets and either a staple gun or some push pins.
That’s it. Of course, it helps that I only live 0.5 miles from the range. Literally 2 minutes from my door to the shooting line. So, there’s not much reason for me to put in a whole lot of error lugging a big bag around.
I might think about a first aid kid though.