Let me tell you right now, I'm not a golfer.  My husband is not a golfer. I barely know anything about golf.  BUT I do know how to do gift bags, so that's what I did.
Here is what is in the swag bags:
- hand wipes
- chips for ball markers - see below
- golf tee
- mints
- bandages
- key chain - see below
Just a few little things to make golfing a little bit easier or more fun.
I had some struggles putting these together. Such as:  local stores not stocking all of the supplies I needed, ordered supplies not arriving until 2 days after the bags were due and generally being a ball of stress trying to get everything done.  
This tournament was a fundraiser for my daughter's high school swim team.  So I made the ball marker chips in school colors.  I made them by painting wooden discs with craft paint.
These supplies would come in handy on any golf course! 
How to make a metal stamped key chain
Stamp out the school's initials with metal stamps onto metal blanks.  (similar here)   Use purple leather cord folded over a key ring, then tie off with yellow floss.
After all the supplies are ready, gather them into a cello bag.  I found purple star bags at the dollar store.  Clear cello bags would work great though.  
These bags were put into a larger bag at the tournament with other supplies like a can coozy, a pen and pencil, and some bug spray.
Hopefully this will give you some ideas of what to put into Golf Swag Bags!
 









