In addition to what has already been mentioned, golf balls, tee, markers, divot tool, etc.. I also have a small med kit (Band-Aids, aspirin, bug bite stuff, etc..), definitely bottle water, always have an umbrella, rain suit, club cover that came with the bag (if you don't have one, get one). I have a range finder (just a cheap binocular one) and my cell phone (turned off) but there if I need it. I carry at least a dozen balls, combination of 2 or 3 sleeves new and the rest old, I carry 3 gloves, to change out on hot days or in rain, two towels, one on a "D" ring and the other folded in the bag pocket.