I usually keep it light. I have a pouch that I'll keep some western birch tees, a ball marker from seamus golf, a divot tool from miura that I really like, laser, 2 gloves and 2 sleeves of left dash pro v1x. About the only thing that goes in there otherwise is a bottle of water and my keys.

I used to carry a lot but transitioned to a minimalist approach.

-Tees
-FSU Divot Tool
-2 ball markers
-Skratch Energy Bar
-Red Sharpie
-Rain Hood
-Towel
-15 or so loose balls
-2 Alignment Sticks
-Hydro Flask full of water

6-9 balls
2 gloves
1 pair of rain gloves or winter gloves (depending on time of year)
2 alignment sticks
rangefinder (in case)
golf towel
sweater, rain jacket or winter jacket (if needed)
extra socks (after the round)
valuables pouch which holders (tees, ball marker i.e. $0.50 piece, LSU divot tool)
Gatorade water bottle

1. Dozen ish balls - Pro v1x
2. Loads of tees and markers
3. Pitch-mark repairers
4. Two gloves
5. First aid kit
6. Water bottle
7. Vokey towel
8. Laser and GPS
9. Waterproofs for me and golf bag (Scotland!!!)
10. Tin box partners yardage book cover/scorecard holder
11. My lucky old golf ball!

Multi purpose tool
FJ Short sleeve pullover
Western Birch and long orange tees
9 Pro V1X
Cigar lighter And cutter
Oakley golf sunglasses
Neutrogena sunscreen spray
Waxed dental floss
Beef jerky

Late to the party, but a nice thread.

A new sleeve of Pro V1
+ maybe one or a couple of yesterday's ball round
Titleist ball marker (large)
+ a couple small plastic stemmed marker for up close to the hole
Titleist divot tool
A few wooden tees
A Titleist wrench (I had a lose screw hybrid once but recent)
2 or 3 Gloves- range use and the other two rotates in the round.
Sharpie
Line stencil in case my mark is similar to others.
Team Titleist bag tag.
Carmex lip balm
Blind sun glasses- Rx
Towel
Scope
Yardage book
(will be adding an extra battery)
Snack (energy bar, beef jerky, or oats..)
Bottle of sparkling mineral water.
Wind breaker (year round)
Keys

Normally I ride, so I keep a bit more in mine.
FJ Rain jacket/pants
FJ Rain gloves and two FJ StaCool gloves
SPF 50 suntan lotion and a can of bug spray
At least 6 Pro V1x balls, normally #74
Titleist players towel and a microfiber towel to carry away from the cart
Two pitch repair tools, one with a magnet that holds a TT ball marker
One poker chip ball marker (varies) and usually at least one other ball marker
A pencil or two from one of my local courses, with eraser
Wooden tees, in regular and short length
A Titileist valuables bag for my wallet and watch
Range Finder; portable battery pack and changing cable for my phone (GPS)
Spare battery for my range finder
First aid kit, small
Titleist driver/fairway wood/hybrid tool, just in case
Scorecard cover, with pencil
Water bottle, depending on the course

Nice essential list Ted!
Yes, pencils- still working on my orgskills.

My bag is fairly boring..

2 new gloves and about 6 used ones
A dozen Pro V1s
Cypress Point and Penn State Golf Courses bag tags
About 50 Pro Length plastic tees
Z6 range finder
2 backup rechargeable batteries
Sunscreen
Scotty Cameron visor
Scotty divot repair tool
Dimes and assorted ball marks
Advil
Titleist 68 inch double canopy umbrella
TT valuables case

Scotty Cameron blue tour rat ball marker.

Vokey divot tool/bottle opener.

Disney World tees.

Handful of Titleist golf balls.

Extra FJ gloves.

Towel.

Scotty Cameron pivot tool.

Water.

Snacks.

Oh, and now I have added a small bottle of antibacterial hand gel (like most of you have done also). Crazy times.

2 gloves
Dozen golf balls
Blue tooth speaker
Tees
Umbrella
Valuables pouch
Ball marker

Golf Balls
Extra glove
Ball Markers
Divot Tool
Wooden tees
Titleist Towel
Ball Retriever
Granola bar
Bottles of water
Club Brush
Umbrella