Depends on what my plans are for the trip, but usually just a rangebag with the following:
1) firearm(s)
2) min 300rds per caliber
3) gun mat/towel to rest firearms on so not in direct contact with benches
4) misc cleaning supplies
5) misc extra mags
6) eye and ear protection
7) brass container (bag/box/whatever for empty casings)
8) misc tools for possible mechanical issues
9) targets
10) staple gun/thumbtacks
11) flashlight
12) laser boresighter
13) sand bags (usually not in the range bag itself)
I think that about covers it.
You got a favorite range bag? I am in the market for my first (I use a military backpack right now...)