Ok besides the obvious,

Lighter and rolling papers of course

Tongue Scraper

Good underwear, lightweight/quality material clothing (I have some Vuori stuff, looking to get more and just only carry that cause it doesn’t really get nasty as fast as regular cotton, washes, dries, folds up easier too)

Little packet of tissues, or even just a couple napkins

WATER BOTTLE OMG

Pen and paper, even just a little piece of scrap paper I always keep at least on Sharpie on deck too

Sunglasses - consistently one of the absolute most helpful things ever while out and about.

My tech pouch, any cord I have lives in one place

Tiny cross body bag, can clear out all pockets on my person if needed and just provides an immediately accessible storage

Headphones, AirPods are badass and some backup wired buds too