For my regular shorter rides not far from home, all I bring is CO2 inflator and one cartridge. I'm talking rides I could get a ride back from, or have a nice long walk home from if somehow I got a really bad puncture or gash. Anything longer, it's the CO2, a spare tube, a mini pump, tire lever, boot, bacon and tool. If I was going on a long bikepacking journey, I'd bring a way to sew up a bad sidewall gash.
I live where it's hot and dry and put in 2oz sealant in each tire every 3-4 months.
If you're new to tubeless, I think you'll be pleasantly surprised how little (if ever) you use half of this stuff out there!