Fine point pen, spare batteries, mechanics mirror, tweezers, small flashlight, small notebook, gardening gloves, water bottle sling and my most recent acquisition: bi-focal sunglasses. Seriously, I can't see anything in front of my face without reading glasses. I had cheap drug-store readers in my geo-bag so my good prescription glasses would not get scratched or otherwise damaged, but constantly switching off between the readers and sunglasses was a pain. So I splurged and used my Costco rebate check to purchase the bi-focal sunglasses - love them!!!
And geo-clothes: long cotton pants with deep pockets and hiking shoes - sturdier than sneakers and I don't care if they get dirty, wet, etc.
Except for the pen and batteries, most of my 'equipment' has been acquired over time as I experienced the need for a 'tool' I didn't have.
I like the idea of toothpicks to roll up nano-logs - thanks for the idea! I'll add some to my geo-bag.
And don't forget a cell phone in case you get in trouble.
Have fun!!